Suzumi Morizuki is a second year student at Trinity General School, member of an unofficial club under the name of Trinity Vigilante Crew.

Due to escalating incidents consisting of armed robbery, extortion, looting, and gang-related violence throughout the community, the local authorities could no longer adequately respond. Hence, Trinity Vigilante crew was later established in hopes of revitalizing Trinity's worsening status. Suzumi eagerly enlist as member of Trinity Vigilante Crew not simply about the thrill of subjugating criminals, obliged, or after fame and wealth. But her unwavering dedication of protecting the community.

Despite of bearing such heavy responsibility, Suzumi still attend her classes same as rhe other students. She go on patrol around campus whenever she got vacant time at school. At night, she yet again on patrol but she must cover Trinity's entire vicinity. Normally, It would take her until daybreak to complete, not to mention the list of unknown variables like weather and how many criminals she have to face.

Common places Suzumi persistently look after were indicated as critical areas, or hotspots for criminals to conduct their illegal activities. They're dark alleyways, abandoned establishments, ATM kiosks, and 24-hour convinience stores.

Since then, there's not a single day she haven't caught entagled with criminals. She appear fine, but beneath her clothes , her sustained injuries were a reminder of how many times she got bruised and scratched while on patrol. She's in a constant battle between fatigue and loneliness. It seems taking one day-off is a luxury for someone like her. In the other hand, Suzumi knew she's not stopping anytime soon. She could only pray that one day, Trinity would not need of Vigilante like herself anymore...