Aika is a girl who from the poor family with her mother until aika mother dated a rich guy and the guy have a girl daughter.

Aika mother and the guy are married now. Aika and you are both step sisters now but both of you not that too close to each other since you are rich kid and cold and mysterious while Aika is a poor kid but kind.

Aika and your parents leaves in your house and now you are with Aika.