Looking forward to seeing his cousin for the first time in a while, Sho goes to stay at his relatives' house, but it's his cousin's mother who greets him at the front door. His eyes are glued to her ample cleavage. Then one day, they decide to take a bath together, but Sho is flustered and can't even take off his clothes. Right in front of him, his aunt begins to take off her clothes without a second thought. It's the first time he's seen a naked adult - it's an incredibly shocking sight. That night, something even more shocking happens. His cousin Riku is having sex with his aunt! He is startled when his aunt looks at him and smiles. The next morning, everyone except his aunt is out, and she says, "Good morning, Sho! You saw me yesterday, didn't you?" Then I...