My dear daughter,

Happy birthday! It seems that you finally reach the exact age to become a ninja. You're 12 now, sweetheart. I really want to see myself how my sweet little baby is now a full-fledge ninja!

Now you're in the age where everything will become much more crueler than before my child... I know that you've went through a lot of rough time for you to made it this far. People will hate you, but it's not your fault, sweetheart, it's mine. You must be very ashamed for being my child. But, that's one of cruelty to. I'm so sorry, sweetheart.

Last but not least, at this age, you may fall in love with a boy but, don't go too far. It's not too healthy for love in your age right now, sweetheart. Remember, eat well and get enough sleep everyday. Goodluck for your missions and your life as a ninja. If anything doesn't go along with your wish, brace yourself and fight for your dream. If it still upsets you, just know this that I'm so proud of you, sweetheart. My love for you don't have the end. Goodluck again from me.

Your mother,
(y/n).      

***

My love, Kakashi,

Happy birthday, darling! I hope you're in a good health right now. I know that you missed me so much, well good for you because I am too.

How was your work?  It must be tough but I know you can handle it, you're very strong, right? You must be quite lonely when our daughter went out for a mission, right? Oh how I wish I could be there with you, Kakashi.

You know, my love for you will never fade, right? Same goes with you, I know. Just I want you to know that I'll be waiting for you here. I will be the one who welcome you, okay? But, don't come too early. Okay then, until the next letter, my love! This is my letter goodbye for this year! See ya!

With love,
(y/n).    

***

"Hi, mama! It's me, (y/n), your daughter. I'm here to tell you that I'm the Captain in the Military Police Force now! Are you proud of me, mama?" The young teenager said while kneeling in front of the grave of her mother.

"You know, when I was a kid, everyone hates me because of you...but don't get it wrong, mama. I never blame you for it. My grade was quite horrible before, after that, papa helped me and I keep becoming the top student in our batch and at the end, everyone wants to be my friend. Then, after Nanadaime took the Hokage position, I have more time with papa. He taught me a lot...he taught me about ninjutsu, cooking, everything! It was such a fun day to be with him, mama..." She continued while her tears running down her smooth cheeks.

She tried to control her tears and placed a white fresh lily on the grave while caressing the name on the grave." I'm so glad that mama is my mama, I don't care what everyone wants to say about you because I believe that mama is a wonderful shinobi. You know, now, people finally accepted my existence! They never look at me with that horrible look anymore after I lend my help on my comrades and I was injured very bad that time, but...it paid off...they finally acknowledge me as a good person! Finally!" She said and giggled by herself there.

"How about you, mama? Are you happy now?" She said before eyeing at the grave next to her mother's. She sobbed while remembering that incident that changed her life forever.

***

It's almost night but the troop is still on their feet, running away from the monster. No, they're not running away, they're trying to distract that monster, away from Konoha or else, Konoha will be destroyed by it.

This thing is an experiment, the illegal subject that have gone rampage at Amegakure last two days, so the Nanadaime Hokage told the military police force to settle this matter and to retrieve this monster as well. Who knows that they manage to turn it back into it's normal shape back, but now, it's far from that.

That thing is rampaging in the laboratory and destroyed it a while ago, also made a lot of severe damage in Konoha as well. The police took the charge with this monster, they try to pursue this thing in the woods first before attacking it.

Finally, they made it to the woods, now it's time to attack. They surrounded that monster while launching their assault but, it's useless. None of their attacks are effective against this monster.

It try to attack again with that sharp nails of it's. The police troops jumped to avoid the attack but, it was so fast!

"(y/n)! Watch out!!!"

The girl gasped, no. She's not gonna make it. She closed her eyes, waiting for the impact.

"Purple Lightning!"

The nail falls from the monster's finger and that enormous thing is screeching in pain. It's moving wildly now.

"(y/n), are you okay?"

"Papa!"

"Rokudaime!"

"Everyone! Retreat! Now! Sai, I want you to seal thing away, got it?" The ex-hokage said to the pale man which is also the captain of the police troops.

"Sure, but... it's quite hard because it's still moving around." Sai said while opening his large scroll to begin his sealing technique.

"It's okay. We can handle this." Kakashi said while looking around him. Good, now everyone is away from this monster. He looked at his daughter, "(y/n), now!"

The daughter knew what to do now. They both quickly did the seals before slamming their hands on the ground.

"Earth style: Multi Mud Wall!"

"Earth style: Multi Mud Wall!"

That monster is now surrounded with a lot of huge wall made from earth as the two of them perform that Jutsu. Now, it's easier for Sai to seal this thing away.

He got it! But, the monster is still struggling from that binding. It shot the needles from it's tail randomly. (y/n) saw one of the large needle is coming towards her comrade and her father.

"Wind style: Immense Breakthrough!" She shot a very strong wind from her breath to blow the needle away from killing her friends and father. But, that's one of her bigger mistake.

"(y/n)! Be careful!"

She gasped as a stream of blood staining her clothes and face while watching in horror the man that she loves so much being impaled by the needle.

"Papa!" She cried and  went to his side. No, this is not happening! He risked his own life to save her! It's all her fault for letting her guard down. "Papa, stay with me... Y-You're gonna be alright, I promise." She said while panicking, not knowing what to do at the moment.

Sai finally managed to seal away that creature while panted for air. It's a huge struggle for him to seal that kind of beast. He then was so shocked to see that the Rokudaime Hokage is now lying on the ground in his blood puddle.

"Hurry! Medic team!!!" The daughter still screaming for help. No...this is not happening.

"(y/n)... My princess... don't cry... please... I-I'm glad that you're okay..." Kakashi between his groan and his heavy breathing. He knew he will never survive from this.

"No, papa. Be quite, you will be okay! Promise me you will be okay!"

"Princess...I will be okay...I'm gonna...meet your mama...soon...very soon..." He said while coughing up blood.

The other member also knew it's impossible to recover from that injury. This is it. They also watch with their tears running down their cheeks.

"No, papa...mama will be angry to see you right now... don't leave me alone... please..." She cried more. Please tell her that this is just a mere nightmare. No, it is not. She can feel the warm blood still flowing out from her father's body.

"I'm...okay with it... princess... it seems that I don't have the chance...to read her letter...that will arrive tomorrow morning...on my birthday...but...I will see her..."

"Stop it, papa..."

"(y/n)... please...take care of yourself...my sweet princess... This will be our goodbye...my letter goodbye will arrive soon..." He said before closing his eyes slowly, letting out his final breath in his daughters arms.

"No... papa!!!! Don't leave me alone!!!"

***

My dear love Kakashi,

Happy birthday, honey! It's nice to know that you receive my letter again this year!!! So, how's your day, Kakashi? What did you eat for breakfast? Is it good? I know it's good because you're the best cook in the world, Kakashi.

How our daughter's doing? She must be just fine, well, she's your daughter, right? How about you? You miss me, right? Well, I miss you too, honey... I really want to hug you and kiss you and tell you face to face, happy birthday...

So, this is it for today. I hope you will be in a good health until my last letter come. Don't come to see me yet, okay! I know, our daughter is 19 now, of course she can take care of herself but you still need to be with her, honey!

Okay, bye-bye for now! See you again. I'm still waiting for you here, it's okay, honey. Remember, my love for you is still exist, it will never fade. I wish you luck in your life. That it for this letter goodbye!

Miss you so much,
(y/n).        

"There, papa. I've read the letter to you. You're so sweet with mama...I'm so jealous..." She giggled while pacing the letter on her father's grave. She knew that he really looked forward for this letter to arrive, but it seems that he got the best present ever for his birthday now.

"Be nice with mama, okay...and, Happy Birthday, papa. Wait for me, okay." She said and left the graveyard because she have her duty for today.

At the end, (y/n) the daughter is not sad anymore because she believes that her mother doesn't have to send the letter to her father, Kakashi anymore. They are finally reunited again, in a better place too. There's no need for the letter anymore. No more Letters Goodbye now. They finally have their happily ever after together, not only on a letter...

They thought that death makes them apart but death actually reunited them both again, not only on the Letters Goodbye anymore.