Yareruko! Densha Ecchi

Both are made by the same studio and as such the animation, character design, artstyle, between others is very similar, even the format is very similar (ONAs with two episodes with a short time per episode), Yareruko! Densha Ecchi has some of rapey vibes (not totally, the girls are completely submissive), and Muchi Muchi involves tricking inocent girl who don't know what sex is, so they are kinda alike in that aspect. 

So if you see a hentai with "densha" in the title, give for a fact that it's about chikan, which means groping, and densha means train, you don't have a genius to get that one, the animation is nothing alike between the two, since they have more than ten years of difference and Yareruko! Densha Ecchi only has one guy, but the fixation on "chikan densha" is strong in both, all the important scenes happen inside a train, you can't say they're not alike.