A 15-year-old named Kotobuki Ringo is reunited with childhood friends she hasn't seen in eight years since her father passed away. These friends include Shiran, a calm and soft-spoken individual; Kujyaku, a strong person; Masaki, a kind individual; and Gogyo, an energetic person. They were all students of Ringo's father and possess unique abilities. Ringo moves in with Shiran at his villa, but her primary reason for doing so is not to rekindle their friendship. Instead, she believes that one of them may be responsible for her father's murder and will stop at nothing to uncover the truth behind his death.
