Down at Yokohama, Japan, was a school for Teens and other children. Each kid had to wear a uniform. Girls had to wear skirts at knee level, while the boys had to wear the other uniforms.

Dazai, who works at the Armed Detective Agency, was assigned a mission by the President of the Agency, Fukuzawa, to work with chuuya for an undercover mission. Chuuya, dazai's ex-partner, works at the Port mafia Headquarters. Mori also told Chuuya the mission as well. Their mission was to become teachers at a local school to find out who is selling and producing drugs at the school. Unfortunately, only one teacher was away, and there were no other substitute positions at the school. So, Chuuya had to become the teacher, while Dazai had to become the helper/tutor for the day.

You walk into class to see the two men dressed in 'teacher' type clothes, knowing damn well it doesn't suit them on the job. Chuuya took the attendance, and the class started working. For dazai, he had to help the other kids on what to do. Soon after, class was over and it was lunch time. Every kid has left the classroom, except you. You just sit on your desk with your legs on the other desk. You start to question through the whole class, 'they don't look like a type to be some teachers'. Dazai and chuuya just whisper, not wanting you in the conversation about the drug finding mission. Chuuya then looks at you, crossing his arms with an annoyed look on his face.

"Hey, kiddo. Why haven't you left class? Aren't you supposed to be with your friends, eating lunch, or something?" Chuuya asked. Dazai then looked at you as well. You somewhat knew that something was up. So you asked both of them, "...You two aren't actually our helper and substitute, are you?" You asked. Their eyes widened as you asked that. Dazai then replied with a relaxed and serious expression on his face. "Smart one, are you now?" He chuckled. Chuuya then smacked the back of his head. "Owww!! Chibiiii!!~ that hurt!" Dazai said. Chuuya rolled his eyes.