Now be warned this will be part one of the seven deadly sins idea but will focus on the melban ship, which is a crack ship but I love.
  So with that let's begin.

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Okay so as we begin, Ban is new engaged. We see him rushing around with King joking having as much fun as can be seeing as they will be brothers in a matter of only hours. Everything seems perfect as they stand with the rest of their friends, minus a certain blond for reasons that will become apparent later.

That is the moment Elaine walks down the isle. Ban tears up just beaming holding her hand. He is just so happy. Everything is going perfect and he finally has a loving wife he always wanted..

That is until she drops dead during the kiss.

Now Elaine has always been sick ever since she was young. She almost died multiple times and was told her heart was weak for years. So she was expecting to die before she got to old. She prepared Ban and everyone she knew for it. She had a will. She had a grave stone set and even had her own funeral picked out. Yet, she never would have guessed as she leans in for the kiss on her wedding day that her racing heart would suddenly stop.

Neither did Ban.

All he knows is that their lips met for less then a second. He held onto her hand thumb rubbing over the ring as their lips brushed together. Then she got cold. Like suddenly cold as the winter air. He could hear the crowd cheer and as he leaned back, she dropped down to the ground dead. From there it was a blur.

Ban could remember people screaming. He could remember the panic as he tried to help. He remember carrying Elaine to a doctors....yet from there his mind goes blank. He just remembers sitting near her grave 3 days later watching as she is slowly buried, tears springing to his eyes watching her disappear bellow the ground, leaving him too soon.

From there, well he just sits in bed for days on end. Or at least he thinks so. He just remembers seeing her grave every time he closed his eyes for weeks on end as his brother in law takes care of him day in and day out. As he is cared for Ban builds up a wall. He swears he will never love anyone again until he sees Elaine. He is not going to move on ever. He is just going to wait until he can see her face again smiling and bright as ever. Until then he is happy to be alone for the rest of his life.

And he keeps to his word...He never loves again...That is until the incident three years later...

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When we open back up it's three years later and King and Diane are finally getting married. Ban is his same old self, but as mentioned before he kept to his word. He has no other loves and drowns his sores in booze whenever he has the chance.

The day before the wedding they're having the usually batchellor party with Ban as a host. They are all drinking like mad during which having fun until Escanor has to go pee which all the Drunken idiots decided to do outside with him cause fun and only real men piss in the woods according to escanor.

Once they are all done peeing in the woods they start teasing king about messing up his vows during the rehearsal earlier that day as they walk back. This goes on until King snaps holding out the ring drawing them all to try it out here then if they think they can do better.

So they attempt to do just that.

Of course they are all drunker than a sailor and keep dropping it one by one. That is until Ban gets it just as they pass by a creepy tree. One that even creeps Gwother out, which is rare. No one can say why other than it just is a freaky tree with weird branches.

Hey those thoughts are drowned away as Ban recites the vow...Except half way through ten the vows are no longer King's. The vows switch to those he told Elaine the last day he saw her as his eyes water. Just as he finishes he leans against the tree looking down where he sees a branch sticking out of the ground that looks like honey hand. The same one that belonged to Elaine all those years ago.

And slowly he slips it on the branch before kissing it picturing it as Elaine's hand giving her a finale kiss goodbye. This do course is when a few tears fall as his friends help him up to his get. King tries to comfort him walking away forgetting all about the ring until Gwother screams in terror, which is rare. Nothing scares Gwother ever after all.

Then they see the branch digging it's body out of the ground. The body of a boy who has been stabbed with a bag over his head who stands before them making them all freeze up for a few moments wondering what is happening. Then he rips the bag off his head showing the face we all Know belongs to Meliodas saying one chilling line,
"I do..."

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When Ban wakes up he is in purgatory with souls who have died but have yet to move on, who are the demons in the anime. Yet, unlike in the anime they are just happy to be around and don't plan to kill anyone. And amongst them all is Meloidas, Ban's new husband who is just so excited to have someone to love him again.

Just like in the movie Ban freaks out that he's married to a corpse and demands to know who he is. This makes a soul move onto a musical number, which is just remains of the day, where we find out how Meloidas died.

He was the son of a rich merchant who fell in love with a beautiful women who's family was hated by his own. Meliodas asks his father for permission to marry her and gets a no. So he packed up some money, puts on his fathers tuxedo, steals his parents wedding rings and goes to run off with his women. Yet, turns out she didn't love him. Instead she just wanted money to run off with with her real boyfriend. So they knock Meliodas out and burry him alive, where he wakes up deader than a door nail a few hours later. Once he makes his way to the land of the dead and realizes what happened to him he decided he would rather stay in the ground where he was buried for the rest of time.

Yet, when Ban put that ring on his finger he made Meliodas feel something again. He made him feel joy and...well now Meliodas is back under with his friend ready to move on.

Ban upon finding out he married a corpse, runs off to try and find a way back up for his friends wedding. He just has too. He climbs every little building or stair case he can before breaking down, having a moment of silence on top of the highest balcony where Meliodas winds him with a box. Ban just ignores him for a bit, which he expects to be interrupted. Yet, mel just lets him sit there. He lets him think some more. He even waits for Ban to talk to him first.

Slowly Ban sits down near the tinier dead boy looking Star struck. How did this happen? Did he really marry a corpse?

"It's a lot to take in I know." Meliodas speaks up slowly.
"Yeah....yeah it is." Ban blurts out looking over the village of the dead. It some how seems more....alive then the normal world of the living.
"I...I shouldn't have dragged you here before explaining myself." Meliodas sighs.
"Yeah not gonna lie that would have helped." Ban sighs before looking at his more human looking face. Mel turns to face him and they make eye contact for the first time and Ban could have sworn he saw his eyes before. "Is there anyway to get back home? I have somewhere I need to be..."
"I...I...look all I can say is, I should have thought through my actions more..." Meliodas blurts out.
"What do you mean by that?"
"Well the underworld has a way out and in.."
"I mean obviously how else would I have gotten here..."
"Yeah the trouble is...Bel is it?"
"Ban actually."
"We'll Ban, you kinda have to be dead to go through the entrance back up..unless your a death mage....and I may...I may have trapped you here...."
"What?"
"Look I'm sorry-"
"HOW DID YOU NOT KNOW THIS?!"
"HOW AM I SUPPOSED TO KNOW! IT ISNT LIKE I HAVE HAD THIS HAPPENED BEFORE!!"

They just late at each other for a while before Meliodas sighs. "Look i..I know it's not much for trapping you here, but I..well I got you something..." he holds out the box he is holding.
"What? You trap me in the underworld-"
"Purgatory."
"Trapped where ever this is forever and give me a box! I don't want your damn gift!" He yells knocking the box to the ground, and out tumble some bones. He jumps back seeing their the bones of an animal that slowly start to reform into a Skelton dog. The same dog he had when he and Elaine first started doing out.
Ban finds his eyes shining as the dog jumps up on him giving him some nuzzled when something hits him. Something big.

Meliodas had gifted him a dog that died 6 years ago. A dog that had died before Elaine. Which meant, Elaine was here. She was somewhere here. He could see her again! He could say goodbye or even be with her forever.
"I know it's not muc-"
"Can you help me find Elaine?" Ban blurts out holding his Skelton dog close making eye contact with Meliodas.
"I...who?" Meliodas asks slowly crouching down to pat the dog, who just loves the attention.
"Elaine..she was my wife...."
"Oh-"
"I mean she was for less than a minute but I never got to say goodbye. It would mean the world to me if I got to see her even just one more time....would you know where she is?"
"I mean we had a girl two years ago who died on her wedding day but she moved all the way to the other side of the land of the dead to be a helper to the only death mage we have down here......but it's at least a three day journey.."Mel explains looking at his husbands face. Upon seeing the heart break in his eyes, he just sighs. He trapped him here as his husband, the least he could do is make him happy.
"I can pack my things and we can start our journey tonight...."

And from here the plot kind of goes like Shrek. They go on a three day journey to the other side of this realm. They journey trying to get there to find Elaine. And along the way slowly gain feelings for each other until they finally reach the mages home.

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Once at the mages house Ban makes a discover. Elaine has moved on. She moved on once she watched King get engaged, planning to see Ban again later. She moved on before Ban could learn a spell the revives the dead, giving their lungs breath once again depending on how long they have been dead.
And he's absolutely crushed. He never gets to see his wife again. He never gets to see his friend again. He is stuck here all because of Meliodas.
So they argue screaming at each other before Ban yells the only line anyone I know can remember about this movie. The way he says it goes like this.
"How was I supposed to kn-"
"I DONT KNOW YOU HAVE BEEN DEAD SO LONG I JUST FIGURED YOU KNEW!!"
"Ban, I have only been dead for like two month-"
"I DONT CARE IT IS YOUR FAULT IM HERE! THIS IS ALL YOUR FAULT!"
"Well maybe you should have thought about the consequences before you asked me to marry you!"
"Why CANT YOU GET IT THROUGH YOUR HEAD, IT WAS A MISTAKE I NEVER WOULD HAVE MARRIED YOU IF I KNEW IT WAS YOU!"
And with that Ban storms out to sulk leaving Meliodas sitting in there looking heart broken. While alone Mel discovers that ban technically isn't married to him. It's for two living people to marry, and with one dead it doesn't count. So he's just dragged Ban down here for no reason.
So melio sacrifices his love. He waits until Ban comes in before breaking an egg over his husbands head, whispering a spell to send him back to the land of the living leaving him alone for the rest of time.

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Yet, Ban doesn't want that. He went in to apologize and tell Meliodas he made him feel again. And now here he is sitting on the bridge his husband kidnapped him from. He is standing here in shock before Diane rushes over hugging him tight followed by all their friends.
He's then dragged to the wedding of his friends telling them about his adventure..and realizing he just screwed up and odd sort of love. A love he might never seen again when he dies...after all he might not have any unfinished business and just move on.
Yet, now here he is helping his friend get married feeling numb all over again. All he wants to do is die and go applogize. Heck maybe even go put flowers on his body's site. Hèll maybe even take one of the photos he just walked by of him to snuggle with at nigh-wait what?
He rushes back over picking up the poster to see Mel on it. Mel is the missing rich boy Dian mentioned when he came to town. Mel has been missing for two months. Only two months. Which means the revival spell Ban learned can be used on him.
He can bring Meliodas back to life. He can give him another chance. It's all he can think about as Escanor asks what's wrong.
And with that he's off.
Ban rushes to the forest, friends hot in pursuit scared he's broken down again all the way to Meloidas's buried spot. Once there he starts the spell using his own blood, jsut two drops, for the blood to be used in the spell.
"What are you doing?" Diane panicked rushing to stop the bleeding.
"Stop! Stop please!" He yelled jerking back.
"Ban what's gotten into you?" Merlin asks trying to help.
"Please I just need to see him again! I need to see Mel again and aplogize! I need to make it up to him!" He screws crying a bit. Everyone freezes up before Diane asks what else he needs.
From here everyone helps with the spell, yet some think it's a odd way of moving on from Elaine. Maybe it's a figurative way to release her soul near a creepy branch or something.
At least that's what Diane things before the branch starts to grow skin and scratch at the ground making her scream. Everyone screams befroe Ban drops to his Knees trying to dig the hand up in a blind panic screaming that he needs help. Escanor drops near him, then Gwother, then king and soon Meliodas sits up clinging to Ban gasping for air.
He sits up as his flesh seems to regrow and his body pops back to the way it use to be. And with that he's back. Meliodas has been 100% revived in the arms of Ban. In the arms of his husband.
"Ban i-what did you do?" Mel blurts out.
"I brought you back."
"Why?"
"What?"
"Why? I thought you said you wouldn't have-"
"Mel...you made me feel again."
"What?"
"Ever since I lost Elaine I was numb. Nothing mattered. My whole world was grey and all that made me think was booze. It made me feel like I was floating. Other than that nothing else. Then you came...and you brought light back. You brought beauty back into my world. You showed me joy. You showed me fear. You showed me someone cared. And it made me feel alive again. So if I have to do a spell to revive you that may tie you to me forever so be it...I just want you here, next to me...if you'll have me..."
"Oh I-"
"OH BAN! That's so romantic!" Diane squeals tearing up making a Mel jump and blush seeing all those people. They all blush waving hi before Mel giggles.
"I see you have friends you weren't lying about..."
"Oh yeah! Mel these are my buds, and guys this is Mel my...my..."
"Husband. I'm his husband." Meliodas smiles kissing his cheek.

And with that kiss, they're together for a very long time. For the rest of their lives actually. The entire time as happy as can be...