Based on the CG collection by TORYA!/Otona teikoku (TORYA!/オトナテイコク).

It was a hot summer. Out of work, the protagonist visited his family's house in the countryside. His ambitions were in tatters. He forewent a job hunt in favor of lazing around the house. That's how he got close with his brother's wife. Her name was Arisa. She was a s...