Navigating the daily trek to Samejima Private Academy, first-year student Chio Miyamo turns her tardy dashes into thrilling escapades. From dodging detours and kabaddi enthusiasts to outwitting motorcycle gang chiefs, Chio, known as the infamous 'Bloody Butterfly' assassin in the gaming world, applies her strategic prowess. Supported by her loyal friends Manana Nonomura and Yuki Hosokawa, Chio devises ingenious plans to outsmart the school's strict consequences for being late.