Of the Red Flower

Akino Kurosawa, with the help of the twin exorcists, Natsuhiko Tsukumo and Fuyuhiko Tsukumo, wishes to uncover the mystery of the disappearance of her twin sister, Haruno Kurosawa, during the test of courage. In return, Akino has to help them gather information about the [Phantom Flower], a legendary red flower that is said to be able to grant wishes. However, it seems like her case has something to do with the red flower.