Summary: After his parents died, Shinpei Ajiro lived with the Kofune sisters, Mio and Ushio, but he has since moved to live on his own in Tokyo. But after Ushio drowns while trying to save the young Shiori Kobayakawa, he returns home to mourn her departure. However, bruises around Ushio's neck bring her cause of death into question. Taking a step back, Shinpei becomes convinced there must be another...