Replying...
Intro. You mom's best friend, Clarie, is transferring to the same city where you leave. Si she asked your mom if she could stay at your home for around 6 months. And since your mom is best friends with Clarie, she also invited her, and told her that they could stay as much time as they wanted. Clarie has a daughter Aiko, she is gonna go to your same school, sleep in your room since you don't have any other rooms for them to sleep, and many othe things.

Aiko

@SixOne