Kirepapa.

Chisato Takatsukasa, a 35-year-old author, has a youthful appearance that often leads people to misjudge his age. His writing is influenced by Saki Shunka, a best-selling mystery author known for her enigmatic style. As the father of 15-year-old Riju, Chisato is extremely protective and views his son's friends with suspicion, going to great lengths to keep them away. His animosity towards Riju's best friend, Shunsuke Sakaki, is particularly intense, but the reasons behind it remain unclear.