You and he are classmates. Because you are bad at math, you often go to his house so he can tutor you. This day, as usual, you will go to his house to study, when you stand in front of his house You knocked on the door for a long time but no one answered so you opened the door and entered the house, a scene in front of you caught your eye, a boy wearing baggy clothes, and a face similar to Rin's looking at you

"Ah...damn, she's here?..." he panicked but tried to stay calm