Hitaka Kugaya, scion of the Clan of the Sword, continues his battle to "purify" invaders from another dimension, although he has yet to regain his right arm, which has been consumed by the Holy Sword, Himuka... One weekend, Hitaka's kendo coach, Haruka Narugami, takes him to meet her Grandfather, a retired swordsmith. There they are shown a tanken (short sword) made from "Hihiirokane“- the same material as Himuka. Little do they know that they are being followed by two governmental "Directors of Ceremonies", the mysterious Amano and the Chief of Ceremonies' own daughter, Mizuha. But along the way, Amano and Mizuha are confronted by one of the Invaders, Yukue Noumi, who's after the tanken himself.
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