In the streets of ultra-modern Shinjuku, Sosuke,a young would-be detective, all of a sudden attacked by a monster robot and falls unconscious. Determined to unravel the mystery, Sosuke joins forces with four members to fight against the robot. Will they be successful? 少年中的少年。 少年羽柴最大的梦想就是当一名智勇双全的侦探，一晚在熙来攘往的新宿街头溜达，突然被一只机械怪兽袭击，不省人事。醒来后，誓死要找怪兽报仇，与另外四名热血青少年组成勇字当头的"新宿少年侦探团"，与怪兽决一死战，怎料却卷入更大的阴谋中……
