Tsubaki Mapputatsu, a shrine maiden trained in the sword, accepts a mission from a yakuza leader seeking vengeance against Mamoru Kagemori. Her blade slices effortlessly through nearly any substance, its sole weakness the gelatinous resilience of nata de coco. When the yakuza’s treachery surfaces, she redirects her lethal skill against him, severing ties with her former employer.

Adrift after abandoning her purpose, she enters Mamoru’s school to bridge the gap between her secluded upbringing and the complexities of modern society. Naive to contemporary customs and teenage dynamics, she wrestles with self-doubt, her formal etiquette clashing with casual school life. A pivotal moment of reassurance from Mamoru kindles both personal growth and an unexpected affection, complicating her quest for normalcy.

Rooted in ritual and combat, her disciplined nature contrasts with social hesitations, leaving her adept at navigating battles yet uneasy in hallways and classrooms. Her story centers on this duality—mastering mundane routines and unfamiliar emotions while her past lingers, unchronicled beyond the classroom’s threshold.