The story begins with a grandfather's will. Uta and Ichika are suddenly summoned by a woman who seems familiar yet unknown. She reveals that upon opening her late husband's will, the names of the two granddaughters were listed as heirs to the inheritance. The reason remains shrouded in mystery, prompting Uta and Ichika to begin uncovering the truth. Secrets hidden behind the will, past events, and family connections gradually come to light. This is more than just an inheritance tale—it delves into human conflicts and the pursuit of truth. Along the way, Uta and Ichika are led to confront their own identities and the true nature of their familial bonds.