Which game or manga of Corpse Party is there where there's a transgender character?

I recall seeing her in the manga. I can't recall her name but she's a boy who wore the girl's school uniform and girl panties. One time, I believe she was playing tennis or badminton and her shirt, due to sweat, was sorta see-through and the guys were like, staring at her chest. The main character, Satoshi (the one with the little sister) pointed out the bulge in her undies (how did they even notice) but the guys shrugged it off. Satoshi then told the girl about her shirt and she blushed and went to change it and the guys were upset he told her. (Pervs, derp.)
But does anyone know her name or which game/manga I can find her?

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