Impregnate Sensei! ~I’m Cursed With Invisibility!?~

Terutoshi accidentally kills a baby bird on his way to school and wakes up a vengeful spirit for the trouble. Its price for forgiveness is oddly specific: get somebody pregnant, and the somebody in question ends up being Ms. Sayumi, his own teacher. The curse comes with a built-in complication, too, since any erotic thought turns Terutoshi invisible on the spot.

The actual game runs on that gimmick. Sex has to happen in class, during breaktime, wherever the school schedule allows, but getting there means sneaking around unseen while your own libido keeps flickering you in and out of visibility. It's a kinetic novel at heart, so there's no branching maze to navigate, just Terutoshi's slow, absurd campaign to knock up his sensei before someone notices a half-transparent teenager wandering the halls.