A pet peeve of mine is stories with hapless protagonists, main characters who are too passive for their own good. Conflict that is driven by characters who are so socially inept that they can't figure out how to have a normal conversation.
I would be giving this a slightly lower rating, but the story isn't finished yet, so there's a chance that the MC could grow a pair before the end.
Anyway, our protagonist suffers from depression and attempts suicide at the beginning, being saved by a weird, cold-seeming girl who then invites him to live with her for no particular reason. The gimmick
of the story is that whenever he is at her apartment, he will be "invisible" to her. Not in a magical way, but in a psychological one--she simple ignores his presence from evening until morning. They go to the same university, and while he is outside her place, she treats him as her psuedo-boyfriend.
It's an interesting premise, but they don't do a whole lot with it--a lot of repetition based on his feelings of being invisible, and a lot about feeling that he doesn't know anything about this girl--which is true, because she ignores him completely while living together, and often shuts down his attempts at communication with her in the outside world. All the while undressing in front of him and letting him sleep next to her.
There is a lot of nudity, this being an ecchi, but most of it is in a voyeuristic fashion and not strongly sexual (she undresses around him quite freely, and another classmate basically throws herself at him in a terribly forgettable manner.)
And that is pretty much it. The art isn't terrible, pretty clean, so if you wanna see boobs, there are a few on display (only two characters so far).
The MC basically spends his time worrying about his own passivity, "invisibility". The girl is made to be cryptic, probably has emotional trauma in her past, is known for being frigid, etc. You've definitely seen a lot of this before.
Overall, it's an interesting premise, and there might be some twists in the future, but the pacing is pretty slow. It is a fast read through, since not much happens. I can't score it any lower, because at the same time that it's not all that interesting, it's also not offensively bad either. The main girl is pretty damn attractive, which helps pass the time.