鳴瓢秋人, Sakaido, 酒井戸
Akihito Narihisago was once a happy family man with a daughter named Muku. Two years ago his daughter was killed by the Challenger a serial killer. Soon afterward Narihisagos wife committed suicide out of grief leading Narihisago to kill the Challenger out of vengeance. Narihisago was sentenced to prison. However having killed someone he now is capable of entering IDWells and retrieve information about serial killers. Once he enters the wells he is known as Sakaido the brilliant detective he assists in investigating and analyzing the serial killers subconsciousness.