Takano Masamune falls in Love with Jillian

This story is about how Masamune is in his last year of high school and he is going out with Ritsu Onodera.

When he comes home he sees his mom home with a girl who has white hair and blue eyes and that has pale-tanned skin just like him.

Masamune this is your half sister Jillian Takano and from now on you will take care of her said his mom

But when he is in his senior year after Ritsu and his break-up he begins to have feelings for Jillian which he harbored when they both are raised together.

Will Masamune confess his feelings that he has towards Jillian or will Ritsu??