i've never been able to sleep with lestech before. Aisu Shina Maya Kawamura

Mayato Yu, a couple who suits their surroundings enviedly. They have recently begun to live together and develop their deep love. One day, his younger sister Shina came to Tokyo from her parents' house. When I was glad to see her again after a long time, I couldn't hide the joy of seeing her for the first time. However, there was a certain daring in Shina. "You want to take people's things, don't you?" Shina is getting ready to sleep with her sister's lover, Maya. And the day of the decision is coming ....