3rd person POV:

After the appearance of Olsa, the YDI club originally suspected Mizuki as the true identity of Olsa.

However, after Aiko showed the club and her sister a puddle of blood in the office room, signifying that Mizuki might have been kidnapped or worse.

With Mizuki's disappearance, there the whole idea of what was going on changed.

Was there a third party who broke into the triplets "agency" and kidnapped one of the sisters?

With how expensive their "agency" looked, it wouldn't be too far fetched to believe that someone would kidnap one of the triplets to ransom them off.

Aiko: We should investigate to figure out what happened to Mizuki.

(Y/n): We should first call the cops.

Aiko: But-

(Y/n): If we're going to solve this then we need to first call the police.

Akemi: I'm on it.

She leaves to call the police.

(Y/n): Don't touch anything, we need to preserve the crime scene.

He began keeping an eye on everyone to make sure no one messes with anything while looking around himself.

(Opening theme)

When the police arrived, they quickly secured the crime scene and began questioning the five young detectives.

Eventually the Jintou detectives, Sato, and her partner Wataru arrived.

After getting updated with all the available information the two investigators noticed (Y/n).

Walking up to him the began conversing.

Sato: Why is it that you're at every crime scene we come to?

(Y/n): I don't know.

Wataru: Seems lady trouble has a thing for you.

(Y/n): I rather she didn't.

Sato: Is there anything you can tell us that might help with the investigation?

(Y/n): Hmm...

Looking around the room he saw the fish tank had a tarp covering the top and the sides of the tank.

The mirror was now facing the wall, so no one could see the reflective glass.

(Y/n): The room has slightly changed since I first saw it earlier today.

(Y/n): You might want to perform a thorough-

Aiko: Detectives!

Aiko runs up to the three.

Aiko: De-(clears throat)

Aiko: Detectives. I just got this text!

Handing over her phone, the detectives read the text.

Wataru: "You have twenty-four hours to pay my million yen ransom or your sister dies."

Sato: So someone kidnapped her...

(Y/n):(mind) Why did they text Aiko and not her father? Certainly, he would have access to all the money.

Sato: Wataru, get the computer team to see if they can trace where the text came from.

Wataru: On it.

He says before leaving the room.

Aiko:(sob) Mizuki...

Aiko leaves the room.

Sato: Wa-

(Y/n): I'll go after her.

Running after Aiko, (Y/n) eventually catches up to her on the balcony.

(Y/n): Are you okay?

Aiko: I don't know what to do... My sister... She's been kidnaped...(sob)... Who knows what they'll do to her.

(Y/n): Don't worry, we'll find your sister.

With tears on the verge of falling, she stares at (Y/n).

Suddenly she moves towards (Y/n) and the two passionately kiss.

(Y/n):?!

The kiss was wonderful.

As their lips parted, the two stared at each other. They both felt different things towards the other.

(Y/n):...

Aiko: Please find my sister.

(Y/n): I will find her. I promise.

Aiko: Thank you.

She walked away. (Y/n)'s eyes followed her until he noticed Akemi, Ryotaro, Pen, and Rena had seen that all.

Akemi and Rena wildly blushed. Ryotaro had his eyes covered and Pen gave the penguin equivalent of a thumbs up to (Y/n).

Rena:(blushing) Uh... Uh...

Akemi: Are you two-

(Y/n): No.

Walking past them with a vicious determination, he said...

(Y/n): Keep an eye on Aiko.

Making his way back to the office he took one more good look around the room until his eyes were drawn to the poster of his father.

He then saw something off about it. The bottom left corner had been folded slightly so it would be pointing in a direction. It pointed to the fish tank.

Moving up to the fish tank, he looked around it, until he saw a plastic tube behind it that wasn't connected to anything, but one end led into the tank. The sides of the tank were slightly moist as well, signifying that water had spilled recently.

A frightening epiphany came upon him. He first ran up to the mirror to inspect it. It didn't take long until he saw the mirror itself was gone and all that was left was the frame.

Glancing at the blood-stained floor he tried to figure out how it ended up in that shape. There was no other trail of blood, so that left the question of how the kidnaper moved her without creating a trail, but (Y/n) already knew what had happened.

Wataru then barged into the room along with Aiko, Rena, and (Y/n)'s club.

Wataru: We have to hurry! They changed their demands!

Sato: What!? Then let's go!

(Y/n): Don't bother.

Everyone:!?

Sato: What?

(Y/n): Mizuki is perfectly safe, in fact, not a single hair of hers was harmed.

(Y/n): Aiko is the one you should be considered about.

Aiko: Me? Why?

(Y/n):... Show me your pocket watch and I can explain everything.

With her right hand, she takes the old pocket watch out of her pocket and shows it to everyone.

(Y/n):(smirks)

(Y/n):(mumbles) Got you...

Aiko:?

Sato: What's going on.

(Y/n): Let me help you understand.

(Y/n): The puddle of blood. Can any of you tell me what's wrong with it?

They look at each other in confusion.

Ryotaro:(raises hand)

(Y/n): Yes?

Ryotaro: There's only that puddle...?

(Y/n): Correct. Detectives, tell me if someone was injured enough to bleed that much then why isn't there a trail of drops of it around the area.

Wataru: Hmm... Maybe... It's a setup?

(Y/n): If you test the blood, you'll find it either fake or taken a while ago.

Aiko: W-what are you talking about?

(Y/n): Getting to the point... This was all a setup. She killed her sister and now trying to get you all to leave so she can dispose of the body and maybe escape.

Sato: What body?

(Y/n): The body in the fish tank.

Looking at the fish tank, they saw nothing.

Wataru: What body?

He walked up to the tank.

(Y/n): There's this neat trick where if you put the glass into water or in this case a mirror... It becomes practically invisible.

Grabbing the tarp on the fish tank, he tares it off.

(Y/n): Sadly the side is another story.

Wataru and Sato walked up to the tank, then looked at the side of the tank.

Wataru/Sato:?!

The two saw a naked body in the tank.

(Y/n): That's Aiko.

Aiko: What are you talking about, I'm-

(Y/n): Mizuki.

(Y/n): Aiko was left-handed, but you used you're right-handed.

Aiko: I'm Aiko!

(Y/n): Look Rena in the eyes and say that.

Rena: Sis...?

Aiko:...

Mizuki then took off her wig.

Mizuki:... Don't think you won.

Color began bleeding away from the world and the YDI club along with Rena were pulled into the Usso.

Mizuki had color and a black mask.

Mizuki: You all are going to die.

She ripped off her mask and transformed.

Manipulating the Usso, Mizuki makes the room bigger to fight. She then disappears as the YDI club summon their personas.

(Battle theme)

(Y/n): She could come at any angle, everyone, go back to back.

They formed a circle with their backs against each other.

Akemi: How did you know it was Mizuki?

(Y/n): The kiss. Aiko is an inexperienced kisser. Mizuki has much more experience.

Pen: I'm so proud and jealous of you.

Ryotaro: She's coming!

Mizuki swooped towards the club, Akemi was first to act, using her Persona, she attacked Mizuki with a whip attack, shattering her and revealing she was a fake.

The club was then blasted from the opposite direction.

Rena watched sadly as that process repeated.

Suddenly, a pain goes through her heart, then body, as time slowed to a halt.

Rena:?!

A voice then echoed to her.

???: There you see, good people getting hurt while you stand around and do nothing.

Rena: There's nothing I can do...

???: There's anger in you... If you vow to me, I shall release it for you.

???: Do you accept?

Rena:... Yes!

???: I am thou... Thou art I.

A summoner badge appeared in her hands, with a symbol on it.

???: Thou who has been manipulated and hurt by thy own kin, abandon balance and release thy rage!

Rena:... Attenborough!

Time began moving. A sudden burst of blue flames shattered all the fake Mizuki's. They all then stared at Rena who held a chain that was connected to her persona.

Pen: Puppy!

Akemi: A puppy that hopefully eats you...

Pen: I'm too big for it.

Rena: You crossed the line Mizuki, it's time to pay!

She grouped up with the gang.

Rena: I'll find her, so you can all attack.

(Y/n): Right.

Letting go of the chain, her persona began sniffing out where Mizuki actually was. Attenborough then attacked an open space, revealing it to be a mirror wall that shattered, showing Mizuki.

Mizuki:!!

Rena's persona bit Mizuki and held her still so the others could attack.

The YDI club attacked Mizuki, sending her flying across the room. She tried to disappear, but Rena's persona would always sniff her out.

The tides had turned, it was time for an all-out attack. They all attacked her with everything they had until eventually, they forced her out of her transformation.

Rolling across the ground, she looked up to see the five of them standing around them.

Rena: Mizuki... Why!?

Mizuki:...

Pen: I don't quite understand what's going on.

(Y/n): Then allow me to try and explain.

(Y/n): Mizuki and Aiko were frauds.

(Y/n): They probably used Mizuki's power to commit crimes, so they could solve them.

(Y/n): They most likely used the Usso to give themselves that expensive place as well.

Pen: How do you know Aiko was part of that?

(Y/n): Aiko didn't have a reaction to getting pulled in to the Usso. That means she had been their before.

Akemi: That explains why Rena was pulled in...

(Y/n): Aiko, however, grew a conscience, didn't she? She wanted to turn herself in along with you. Her plan started with stealing the violin, to draw me in...

Mizuki: Why you?

(Y/n): She knew you had changed, so just in case she couldn't change you, she got the son of Daitan to help.

Mizuki/Rena:!?

(Y/n): You two had some kind of plot to do something, but you then turned it into a murder trap.

Mizuki:...

(Y/n): When she wasn't looking, you knocked her out, stripped her, put her clothes on, hid her behind the mirror inside the tank, placed a puddle of blood to throw us off, then lead us to the room.

Mizuki: I didn't want to go to jail... I didn't think, I just... Did it.

(Y/n): There's something we need to know... How did you get your powers?

Mizuki:... It was last year, about 6 maybe 8 months ago.

Mizuki: There was this... Celebration or something... While I was on the bus to go there... Then there was this flash.

Mizuki: Everyone stared at where it came from, and we all saw this crack, that was black and white but was more like a window to the Usso.

Mizuki: I felt weird after that. It didn't take long for me to figure out I had these powers.

Mizuki: I showed Aiko... We took things too far... Now...

Rena: You have to pay the price.

Mizuki: Rena... Will you visit me?

Rena:... Yes.

(Y/n): Time to tell the cops.

Returning to reality, Mizuki confessed while leaving out the parts about the Usso.

With the charges of murder, Mizuki went to jail.

A week later, the YDI clubroom had someone knocking on their door. It was Rena, a new student at their school.

She asked to join the club, and without question, they welcomed her with open arms.

It took a while, but (Y/n) finally met the girls that his father considered his nieces.

Most importantly, he had a lead on the Usso case.

(Ending theme)