In a city inhabited by youkais and humans, Kotoha is an exception, becoming a half-youkai when she was struck by a mysterious lightning when she was a kid. But when she is struck once again, her powers go out of control and start threatening the city until her friends come to save her.
事件の翌日、それぞれに普通の日常が戻ってきた。しかし妖怪を監視し、人間を守る組織・元老院が、秋名の元にやって来る。その頃ことはとヒメは組手を始めるのだが、奇妙な見物客が二人の組手を見つめていた。
