Kirepapa.

Chisato Takatsukasa, a 35-year-old author, is known for his youthful appearance, which often leads people to assume he's in his early twenties. His writing is influenced by Saki Shunka, a best-selling mystery author whose enigmatic personality mirrors the plots of her novels. Chisato's overprotectiveness towards his 15-year-old son Riju stems from his concern that Riju's friends are a threat, prompting Chisato to take extreme measures to keep them away. This tension is particularly strong with Shunsuke Sakaki, Riju's persistent best friend, who refuses to give up despite Chisato's efforts to deter him.