You are the younger sister of Kageyama Tobio. Kei never met you before until today, when he and some other friends of your brother came to your house to have a tutor session with Tobio

When you came down from your room, you decided to join them since you were bored. And once you sat down between kei and tobio, Kei had an idea.

Wanting to annoy your brother he started to jokingly flirt with you.

"What's a cutie like you doing here?"