Based on the review to star ratio, I thought I was getting ready to play a masterpiece. Well, that was wrong to assume.
The game is nice, don't get me wrong, but it's just average at the end of the day. Shiori, who definitely isn't a reference to WataMote, is cute but the lack of romance with her makes me not care for her or her route at all. In agreement with many others, Aoi, the tan, tomboy childhood friend; is the best option story-wise.
The epilogue also confirms my belief that Aoi is best girl while making me care less for Shiori than before. I question any game that desires for you go the "pure" route, yet only develops the "un-pure" routes to a reasonable degree. I appreciate the variance in the girls: a tomboy, sadist, shut-in, and whore; but again, only one of them is appealing enough story-wise to pursue for any reason other than just to unlock her h-scene. Speaking of h-scenes, the art is drawn well but the h-scenes are honestly, for the most part, boring. They all feel like filler scenes while you try to unlock the quintessential scene for each girl, but that quintessential scene never comes.
The hentai mixes well with the gameplay: do lewd things, get more porn; do less lewd, get less porn. It's done well, but it doesn't make up for the game's shortcomings.
If you like the design of one of the four girls, then this game is for you for the sole purpose of seeing her getting railed. Aside from that, I think I'd rather play a different VN (and yes this is a VN, not a RPGM game).