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Case Zero

Summary:

A former Port Mafia intelligence agent disappears without leaving behind a single clue. With both the Armed Detective Agency and the Port Mafia forced into an uneasy alliance, what begins as a missing person case slowly unravels into something far more dangerous. Some secrets were buried for a reason, and someone is determined to make sure they stay that way.

Notes:

This is my first time writing on ao3 guys pls be nice 😭
And english is not my first language so there may be little mistakes please ignore them🥹
Anyways! Have fun❤

Chapter 1: Case Zero

Chapter Text

Rain poured over Yokohama, washing away the sounds of the city.

The streets were covered in dim neon lights, and the night carried the weight of secrets that had been buried for years. For most people, it was just another ordinary evening.

But the Port Mafia was consumed by chaos. Because some files were missing, important ones...

Everyone knew a former Port Mafia member who betrayed the Port Mafia and fled with several classified files years ago, but no one bothered to check the files in the big chaos of someone's betrayal.

Until the day the Port Mafia needed them...

"Where is those fucking files?!" Mori screamed in panic in dark Port Mafia hallways.. Everyone was in panic because they've never seen Mori this angry and panicked at the same time.

"How should we know?! We don't have access to the files! "
A minor member said.

He was right, no one except the executives and leader had access to the files. But Mori completely trusted his high ranked members, so he didn't doubt them.

"Search the file history, don't come to me till you find where are they. " Mori commanded to the search team that works in the Port Mafia.

Everyone got on their computers and searched hysterically trying to find where are the missing files..

Days later a worker in the search team found the former member's records while searching, in the former members files he read something that lead to their searchings answer.

The worker reported that to the Mori, and he took actions immediately. Reaching out to the Armed Detective Agencies. Because in that files had something to do with the Armed Detective Agency.

And Armed Detective Agency and the Port Mafia came to a conclusion, to work together for this once.

Armed Detective sent one of their member, Osamu Dazai. And the Port Mafia sent their executives, Nakahara Chuuya and his subordinate Ryunosuke Akutagawa.

The mission would take at least weeks, so it was going to be a hard time for 3 of them. Especially when Dazai keep provoking Chuuya, and Akutagawa feeling uncomfortable around Dazai. They all knew but it was a mission after all. They had to do it.

"l can't believe the agency sent that shitty mackerel for the mission! " Chuuya complained to Akutagawa while packing his things for the long mission. Akutagawa has already packed his things waiting for Chuuya. He didn't packed many things, only what he needed.

"It's for a mission, l'm sure it will be fine Nakahara-San" Akutagawa said trying to comfort his mentor. But he knew that Dazai will be a problem too.

Chuuya has finally packed his things and both Akutagawa and Chuuya got in the car which will take them to the assigned hotel for them to stay.

No one talked during the car ride. After a couple of hours they finally made it to the hotel. When they arrived, the car that took Dazai was already there, that pointed that Dazai was already there before them.

"Of course he's already there.. " Chuuya murmured...

Akutagawa didn't say anything, he just simply followed Chuuya. He can see red headed boys rising anger. They slowly entered the hotels lobby. A worker welcomed them, the worker took them to a room where pretty isolated from the other rooms. They thanked the worker before entering the room. When Chuuya opened the door they saw a brown haired boy lying on the queen sized bed, watching the door.

As soon as the door opened, the brown haired boy jumped up and runned to Chuuya, causing them to fall to the floor. Akutagawa walked beside the lying bodies to enter the room. He placed his suitcase next to the big closet while the one of the lying bodies flared up with anger, yelling at Dazai. He didn't cared about someone hearing the yelling and getting worried, in fact nothing would change if he cared. The walls were soundproof anyway.

Akutagawa entered the small balcony while Dazai was finally getting up on top of Chuuya. When the two finally was on their feet, Chuuya slowly searched the room with his eyes, then called:

"Akutagawa? where did you go? "

A voice called back from not far. Chuuya followed the voice while Dazai was following the red headed boy.

Then they both entered the small balcony.

"l didn't even realised there was a balcony! "

Dazai said.

"Well l would be surprised if you did with that little brain of yours"

"Aww your hurting my feelings chibi! "

"My ass" Chuuya said. Then they looked at the view of the hotel room, it was breath taking. Chuuya walked inside, walking in front of the fridge.

"l hope they have wine.. "

And to his luck, there was some wine.

"It's not that expensive or beautiful but this will do l think"

Chuuya murmured almost to himself. He took the wine from the fridge and poured to the glass that he took from the cabinet. The glanced at Akutagawa.

"Do you want some, my boy? "

He asked. Akutagawa gave a quiet hum. Then he took one more glass the poured wine. Dazai chimed in:

"What about me? l want wine too! "

Dazai whined.