Shizuko is divorced from her husband and is raising her only son, Kouta, on her own. Shizuko, who has decided to return to her hometown and make a fresh start, is worried about whether Kouta, who is shy and shy, will be able to make new friends. Kota joins the baseball club and has more friends, but even though they are ostensibly good friends, they are actually aiming for Shizuko's big butt. One day, when Shizuko is unwell and is trying to insert a suppository into her anus, she is found by Kota's friend Shimiken, who starts inserting her finger into her anus.