Due to the divorce, she became Dai's new mother. However, [Ruka] is her hard-working mother, and Dai, who is tired of being forced to study her every day, consults with her classmate, the evil kid Masa. One day, Masa lies, "Dai-kun is forcing me to cheat every day." She was shocked and had no choice but to listen to Masa's words in order to protect Dai from being found out at school etc. Dai, who secretly filmed the evidence, blackmails his mother-in-law for revenge!
