I'm gang-raped by my son's classmate every day.

It's been a year since my husband left home alone. Mio lives with her son Yuichi. Yuichi is well-studied and healthy, but Mio felt somewhat worried that Yuichi might lose his classmate's gala and might even go wrong. One day... he witnesses Yuichi staying with his classmates. Mio hurriedly pulls away from Yuichi, but it's too late, and her actions will lead to instilling certain emotions in her classmates...