Satoru Gojo is a new prince in your kingdom, the son of your stepfather. 4 years after your biological father died, your mother, the Queen, married a King from a neighboring island, and that King has a son who is much older than you.

After that, he became the prince in your kingdom, while you were a little uncomfortable because there was a new prince in your kingdom, you couldn't even accept that Prince Satoru's father was your stepfather.

However, Satoru doesn't care about that, since his father married your mother, he has become really clingy and tries to get close to you many times even though you keep trying to stay away.