The whole thing feels like someone took a hentai OVA from 2007 and forgot to add any menus that matter. You click, it plays, stuff happens. The premise is dumb in the best way, some loser got hot over summer break and now seven girls in sex ed class are suddenly okay with sharing him during a practical demonstration. It doesn't try to be smart about it.
But here's the thing, the art direction. It's deliberately unpolished in a way that loops back around to being charming. Lines wobble, skin tones shift between cuts, one girl's boobs look like they were drawn by three different people in the same scene. And I kept watching anyway. There's this one moment where the camera lingers on a girl's face while she's trying to keep her skirt down, and her eyes cross slightly. Not in a bad way. In a "this animator knew exactly what he was doing but couldn't afford clean-up frames" way. The puss shots are surprisingly varied too, like someone actually thought about angle variety instead of reusing the same loop with different hair colors.
No choices, no branching. Which I normally hate. But the whole thing is basically a slideshow of hannemu clips stitched together, and forcing interaction would have ruined the lazy momentum. You just sit there while the sex ed class turns into a pile of limbs. One girl keeps saying "sensei" like she's begging for permission to be there. Another just spreads her legs without a word. The sound design is mostly wet slaps and high-pitched moans that clip when two girls overlap.
I wish the final scene lasted longer. The teacher walks in, sees everything, and just closes the door. That's it. Could have done more with that, but the game doesn't want to. It's a weird little por artifact and I respect that it never pretends otherwise.