Muramasa

A boy named Shiro Masakatsu is disliked by others to the point that people avoid touching him, regardless of gender. One day, he witnesses a girl using an unusual katana to finish a confrontation, prompting him to flee. Later, he encounters the same girl at school, where another katana-wielder challenges her. These katanas possess special abilities known as Youtou, which classify them as cursed weapons. However, activating these abilities requires fulfilling specific conditions.