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"Real-Time 3D Anime Shader", that is both what Illusion calls the game's engine, as well as its genre...Just felt like you should know that.
In any case, you play as a hero who finally returns to his home town to attend his last year(s) of high school. Once attending he finds a club that some of his classmates are in called "Let's Keep It Secret Club" (rough translation). Turns out that everyone else in the club is female, and the "It" they are trying to keep secret are the lewd acts they plan to commit. Seeing that you play as the only male member; it would appear a new life has started for our main character.
"Shut the Hell Up, WM, and Show Me the Keywords": Classic Schoolgirl Pure-Love perversion! What looks like some blowjobs, handjobs, rimjobs (what sweethearts), 3P, Paizuri, Mild Yuri, some potential incest (cousin). The list definitely goes on. However, seeing that this game seems to be pretty damn modular, you probably could stick in any visual fetish you want and hope that someone else thought of it too.