Kaiki! Drill Otoko no Kyoufu

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.

Me and my mother lived in a two-person apartment.
Everything was fine, we weren't rich but it was comfortable.
My father had died when I was young, leaving mom to
raise me. She had her own aspirations, but always put
me first.

Elegant, tender and generous. Very beautiful. I was proud of my mother.
She was mine and mine alone... or so I thought...

Little by little, our happy life began to crumble...

It's all the fault of a classmate I hate... Kazuya Eguchi.

He was shameless, crass, violent...
Everything that was mine, everything I cared about, he destroyed...
That son of a bitch never thought about anyone but himself...
He treated women like disposable sex objects...

The most unforgivable thing is he did it with my mom...