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Language:
English
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Published:
2025-10-24
Completed:
2026-02-20
Words:
7,590
Chapters:
9/9
Comments:
66
Kudos:
98
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11
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2,293

Stupid Mission

Summary:

Yokohama has been separated from the world, no one can get in, and barely anyone can get out.

Port mafia members, Dazai Osamu and Nakahara Chuuya are sent to infiltrate a school outside of Yokohama borders and destroy their plans to get into Yokohama.

Will both their personal lives get in the way of the mission, or will they forget about them?

Continue reading to find out.

Notes:

Basically a soukoku specific version of my other bsd x mha fanfic

This takes place after stormbringer, before dark era

HEAVILY inspired by Artsy_Nova’s This school makes me feel sane

The “underage sex” tag is more brief, but still mentioned

I don’t know if this is canon or not, but I did give Chuuya the clothing he has in the dark era, just so you know

(See the end of the work for more notes.)

Chapter 1: I Don’t Like This…

Chapter Text

He was called up to the boss’s office.

Chuuya opened the door to the boss’s office and was met with a mission. Out of the city.

”Wait, a mission out of the city? Is that even possible?” Chuuya asked, completely confused about the whole thing.

”Yes, it is possible, which is why I’m having you and Dazai go. It’s incredibly important, so any mistakes will lead to punishment,” The boss, Mori, said, not caring about how weird it sounds.

”If you two look in the files I gave you, then you will see your role. Dazai, you will be infiltrating the main villain group, the League of Villains. You will find out their plans to try to get into Yokohama, and destroy their chances.” Mori explained to the tall brunette boy.

”And Chuuya,” Mori said, turning his gaze and attention to the short ginger. “You will pose as a student and sneak into a famous school of UA, as they also have plans to get into Yokohama. You will stop those plans from happening. Got it?”

Chuuya and Dazai nodded simultaneously.

”You’re both dismissed,” Mori said.

The two boys bowed in respect, then walked out the door.

“I hate this,” Chuuya mumbled, barely audible, but somehow Dazai heard what he said.

”It’s not that bad,” Dazai said.

”Yes, it is. We’ve both never been out of the city, and I wanted to keep it that way,” Chuuya said, obviously upset with the mission.

”You just don’t want to leave them behind, do you?” 

“It’s not that I don’t want to, I can’t leave them.”

”…”

”…”

”Look, we can get someone to look after them.”

”If we can…” Chuuya mumbled, before walking away from Dazai.

”Hey, wait up!” Dazai called after Chuuya.

 

—————————

 

Dazai and Chuuya were outside the Port Mafia building. It was decent outside, not too cold but not too hot. 

A black car pulled up in front of the two.

They got into the car, and the car drove off.

Dazai peered over at Chuuya, who was looking out the car window.

”Is my dog upset about having to leave the city?” Dazai asked, sneering.

”I’m not your dog,” Chuuya said, completely dodging the question.

Dazai leaned back in his seat, and fell asleep.

About 2 hours after driving, they neared a stop.

”Chuuya-san, this is your stop,” the driver said.

Chuuya opened the car door and stepped out. Musutafu seemed like a big city, but it was about midnight, and Chuuya was tired.

They had stopped in front of an apartment complex, and Chuuya already had the key to his room, thanks to the file. The hard part was finding his room.

A window rolled down, and Dazai’s face came into view.

”Now be a good dog and don’t mess anything up, okay?” Dazai said.

”Yeah yeah, whatever…” Chuuya responded, already walking away.

The car drove away, and Chuuya started walking towards the apartment complex.

After searching, he finally found his room. He unlocked the door, and stepped inside.

The apartment wasn’t small, but it wasn’t big either. When you walked in, a kitchen was to the direct left, with a living room straight ahead. The living room had a couch and a TV, with various little pieces of abstract art scattered around. After walking straight for a bit, there is a door, which opened to the bedroom. The bedroom had two twin sized beds, and there was another door to the left of the bedroom entrance, which was the bathroom.

Chuuya closed the front door behind him, locked it, and started walking towards the bedroom.

There was a window next to the bed near the end of the wall, and Chuuya decided to take that one.

He walked up to it, placed the file on the nightstand next to the bed, and fell on the bed. He would do stuff like unpacking tomorrow, but he was exhausted and just wanted to sleep. 

Surprisingly, his brain actually let him sleep. Normally, he would just lay awake, and if he did sleep, he would just wake up from nightmares until he gave up and didn’t sleep.