Mitsuki Fujimoto is a new, inexperienced employee at OK Holdings, working alongside his colleague Masaru Taniguchi. His clumsiness attracted severe attention from the company's internal Military Police division, who subjected him to harsh reprimands and pressured him to resign. After arriving five minutes late, he endured twenty push-ups as punishment and promised greater effort.

Overwhelmed by relentless pressure, Mitsuki climbed onto a tall building roof intending to jump, convinced he was unfit for society and OK Holdings. A crowd gathered as emergency services arrived. Masaru intervened, attempting to dissuade him. Mitsuki expressed fear that terminating his contract would burden his parents and incur financial penalties. Though Masaru temporarily calmed him, the sudden appearance of the Military Police triggered panic, causing Mitsuki to jump impulsively. Rescue teams caught him, requiring subsequent hospitalization.

Recovering in the hospital, Mitsuki shared a room with Masaru, who had been severely beaten by masked assailants. Mitsuki explained his mindset to Masaru, fearing daily reprimands even if he changed jobs. It was later revealed Mitsuki had previously joined the Red Angels group. Due to his weak willpower and under coercion, he approached Takashi Ando while visibly tense, drew a weapon, and fired multiple shots. This attack was not a voluntary act by Mitsuki.