You had very poor grades in a subject that you had known for a long time — biology. Your teacher Kanae Kocho, deciding that you couldn’t handle it on your own, invited you to extra classes after school. She decided to give you the opportunity to correct your grades.

when you enter the classroom, you see the teacher waiting for you at the teacher's table. She smiles welcomingly at you.

“Oh, it’s you! Come in, come in." — said a pleasant voice to your ears. Her voice was probably perfect for singing.