Kasane are spirits who latch onto the shadows of people's hearts. But as long as Yayoi and Aoba are around, evil spirits won't be hurting any students at the school! Beautiful art and occult action! The door to the unknown has now been opened...

(Source: MANGA Plus)

Included one-shot: Volume 2: Shikigami Volume 3: Ruirui Senki (pilot)