Janji is a professional monster hunter who takes care of his partner, Iyama Ruan. Iyama is a cold-blooded girl, so it's hard for Janji to find a way to her heart, but he never loses heart. Junji is a reliable and kind person, but he is merciless towards bad people and monsters. From a hundred it may seem that Janji is foolish and not serious even in battles with monsters, but deep down he is very smart and serious, he just hides it behind jokes. His code name is Midnight Hunter.