Takuya was a handsome youth who is a little shy, his mother died by suicide when he was a kid.
He came out his shell by the aid of his step mother Saeko and younger sister Hiyori. One day, he found out that the cause of his mother's suicide was adultery of his father and Saeko..... He made up his mind to get revenge against Saeko!!
"Sorry, mum..... I believed that bitch.....now it's payback time!!!

[From DLsite English]