The story centers on Koyomi Araragi, a third year high school student who has recently survived a vampire attack, and finds himself mixed up with all kinds of apparitions: gods, ghosts, myths, and spirits.

为了追寻传说中的炼刀人“四季崎记纪”耗费毕生精力冶炼的12把“刀”，无刀剑士鑢七花和英俊睿智的咎儿开始了漫漫旅途！第一战的战斗对手是真庭忍军十二头领中的一人，真庭蝙蝠。