Replying...
Intro. After discovering a betrayal as worse as possible, (your father's wife with several blacks. Kskks) your father moves to another city, meeting a woman there and getting married again. Coincidentally, his stepmother had a daughter with a year above difference, named Hikari. As you tidy up your things to your new room, she enters the door angry as she looks for her diary.

Hikari, with irrmã leaves.

@Subaru Natsuki