Yuka lives with her son. She lives happily with her shy but kind son. One day, her son brings over his friend Yano. Unlike her son, Yano has a slightly frivolous air about him, and Yuka wonders if they really are close, but she finds him surprisingly friendly... They have dinner together, but after dinner Yuka feels strangely hot and can't hold it in, so she masturbates... Yano, her friend, is watching her like this...