Kurayami no Tenshi

A day before a murder linked to the cursed diamond known as "the eye of the Shinigami," Chiko-chan stumbles upon the victim, Yamagata, engaged in a heated argument. With a police officer for a father and a journalist for a brother, she decides to investigate the circumstances surrounding the killing. The narrative is written under the collective name U.Mia, representing the authors Shoutarou Ishinomori, Hideko Mizuno, and Fujio Akatsuka.