Kyoufu no Cobra Kan

Shinobu, a young boy, has been orphaned and is now under the care of his distant uncle. Upon arriving at the uncle's house, he is given his own room, but is forbidden from entering a central room within the house. As time passes, Shinobu becomes increasingly curious about his uncle's nocturnal activities, which seem to involve the very room he is not allowed to enter. This raises questions about the uncle's true intentions and the motivations behind his secrecy.