On their 16th birthday happy-go-lucky Aya and her twin brother Aki are ordered to their grandfather's house, where the entire Mikage clan has gathered - but events take a gruesome turn.
Seeing her father's destruction unleashes a power within Aya: she is rescued by Toya, Yuhi and his sister-in-law Suzumi. But what they have to tell her is not well-received.
Refusing to believe Suzumi's story, Aya returns home, then goes to the hospital where Aki is recovering. Her mother confronts her there over her father's death. Meanwhile, Toya is ordered to keep her safe.