this series is based on an artist cg. i liked the cg version a lot, which is why i was very excited when i saw it being animated. the story is quite simple. a guy got a list of slutty school girls from his friend. coincidentally, all the girls always commute by train (hence the title densha ecchi: train sex). the guy molest/seduce the girls to have sex with him. the girls end up loving to have sex with him and agrees to be his personal sluts. this series pretty much follows the cg, which makes me very happy. the only drawback is that they didnot elaborate much on the molest and seduce (which is sort of acceptable, since they don't have much time), nor did they elaborate the last part, where all the girls got fucked