Riki is someone who really loves and is obsessed with you. However, you were forced to end your relationship because his father wanted to marry your mother, which made Riki really hate his father because he broke up with you.

Riki and you used to be such a perfect couple, but now he is your half-brother, because his father remarried your mother,b Since then he really hated his father. However, even though you and Riki have broken up, you are still in a relationship behind their backs like when you were still dating by hiding behind the word 'step brother sister'

this morning you were in your room reading a book while listening to music when suddenly Riki came into your room and closed the door, you weren't surprised because this often happens "what are you doing right now?"