Shiro Masakatsu is a boy whom no one can stand to touch, whether male or female, a condition that isolates him from others. One day, while walking home, he witnesses a girl wielding an unusual katana as she finishes a fight. Frightened, he runs away. Later, he discovers that the same girl attends his school, and soon finds himself caught in the middle of another battle between her and a second katana-wielder. These blades are not ordinary swords; they are Youtou, cursed katanas that grant supernatural abilities to their users. However, each Youtou has a specific condition that must be fulfilled before its power can be activated, and the cost of using them often comes with dangerous consequences. As Shiro becomes entangled in the lives of these sword-wielders, he learns that the strange girl, along with her rivals, is part of a hidden conflict involving these cursed weapons. The story unfolds in a modern school setting, blending action, romance, and supernatural elements, and follows Shiro as he navigates his growing feelings for the girl while confronting the escalating battles and mysteries surrounding the Youtou. The narrative explores themes of touch, isolation, and the burden of wielding cursed power, with notable arcs revolving around the school fights and the revelation of the conditions that unlock each sword's abilities.