START-267 My sister became a single mother and returned to her parents' home, where she gave birth to her virginity to her brother, who gave her his first experience.

Kanako, a former top idol, has returned to the countryside. She is now a single mother and lives with her retired father and unemployed brother. When she was a teenager, she had a physical relationship with her brother. When they meet again for the first time in 10 years, she once again becomes a sexual object for her brother, just like before.