YOU and ME and HER: I watched over 14 hours of playthrough so I'm spelling out the spoilers. This is a hentai game that deconstructs the genre and the relationship of the player to the characters. As you'd guess, you play male visual novel protag Cuckold McGee. Immediately, you find a cell phone and Aoi, who is literally Ms. Capture Target, ie the average of most women in these games. Oddly, this is played straight as she tells anyone who will listen that she is a game character, that she is trying to recharge her existence by collecting encounter (sex) scenes. This is like her day job. You encounter Miyuki shortly after, who asks if you called her to the roof of the school to kiss and declare your eternal love. The protag didn't. You hang out with Mikuyi and try her different routes: learning world details, trying to make Aoi and her be friends and building up that necessary context for the twists later. There are specific events like going shopping for cat-themed hair pins, or finding a cat on the side of the road, or watching batting cage enthusiast Miyuki participate in her school play. At the end of those routes, cuck-boy drifts away from Miyuki, and after warning him 'this is the bad end,' Aoi disappears. Return to a previous choice path, wherein Aoi summons a connection to God (a female entity that sent Aoi) to patch reality so that the protag and Miyuki can get together. You do that, and at somepoint you do the whole kisskiss confess your eternal love. Yay generic happy ending. This is 6.5 hours into the playthrough I watched. So, this being a visual novel, lets take a look at Aoi's route. This is spelled out in the tvtropes page, but the game offers choices that are "give up on Aoi" and "suffer through spending time with Aoi." Yes, its weighted against her. 4 more hours in (again video playthrough), cuckboy 'proves' he loves Aoi as a threesome, and at long last Miyuki puts everyone out of their misery (exceptional). She's mad because you, the player, clicked the button that said you love Miyuki forever. You enter the next 'chapter' of the game, and you're stuck in a montage of Miyuki-only events, raising or lowering her affection to break out of this loop of pointless days. Notably, saving is restricted for a bit, the UI is styled completely differently, and sometimes Miyuki talks to the player. There's a special April Fools intro cutscene for this segment.
Miyuki eventually calls God to patch Aoi out of the game. Things escalate: run-based security questions, a montage of fake endings where Miyuki is sad or whatever, she explains You the player allowing that first patch damned her and the protag together, though that's okay! Because she fell in love with YOU the player, and pleasures herself at length. Steal the phone again, call God to revert everything, enter numbers from previous runs and even IRL promo materials. You then choose which girl you truly love most, and thus which other girl gets atomized. I was grinding my teeth for the first T E N hours of gameplay of exceptionally subtle setup. I promise you could scale the game down by a quarter and you basically would lose nothing.
That said, it truly let you persist in a doomed world, and really hammer home your choices. The game commits and unfortunately for me, I will be referencing it against DDLC and such other games. See also Undertale's No Mercy route for permanently tainting subsequent playthroughs. Between this and DDLC, having a character fall in love with the player is less compelling to me than Undetale's Flowey.