Otoko no Ko Rankou Club

Protagonist Shun was a 2nd year student. He was an average teenage boy, still not interested in girls. Everything changed with the arrival of transfer student Ei.

One day Shun followed Ei to a remote part of the school he never knew about, an underground passage. Ei disappeared inside, then appeared in front of Shun wearing girls clothes.

This was a feast, an orgy of all male students dressed as charming girls. As the perversion unfurled before his eyes, Shun felt his own lust stir...

When the part was over Shun stood alone, sighing in the night that would never feel normal again. His head still spun from what he had experienced.
Guided by Ei's hentai hand, confused about his own aroused feelings, Shun didn't know what to do. The next day he had to talk with Ei. School could wait.

[From DLSite English]