Ase Nure Shoujo Misaki "Anata no Nioi de Icchau!" by Overdose - Adult Sex Game

Takuya Suzuki (the protagonist) was an ordinary student, but he was disliked by his classmates because he was very sweaty compared to normal people, he had bad armpit and body odor. The protagonist fell in love with his classmate Misaki Sato, who is in the athletics club, but Misaki himself in the past ridiculed him, calling him a "skunk".
One day, after gym, the protagonist realizes that he left his sports uniform in the locker room, and, in order not to be seen, goes after her after school, but finds that the locker door is open and the sports uniform has disappeared. The protagonist wonders why, and hears the voice of a girl reaching his ears from somewhere.

"Ahha...ahh..."