@feha The plot you read is a fake plot (at least in my opinion). XD
It's like the plot of a hentai, in practice "protagonist meets girl who died her husband and eventually have sex" (is an example of hentai).
Don't take it badly, I understand that you were hoping for a storyline and many times I hope so too, but this manga had been guessed from the beginning that it ended like this.
Surely the novel will give more explanations, but this manga is obvious that it was created with the aim of satisfying the fans who would like their favorite couples to arrive at that point in their relationship.
Or so I see it, to some extent at least to me a considerable satisfaction this manga.
For once, a protagonist who is not a sissy like "girl accidentally touches him and he walks away not even having Ebola and screaming like a little girl".
I want to say that if you end up in a fantasy world there may be that every now and then you vent yourself, that maybe you'll fall in love and get to that point.
Having the virgin protagonist tired at some point and not asking me why, but this manga can't get tired.
I love Raina too much and I want more scenes of her showing her tender side.
I also follow the raw and I can tell you that it is one chapter ahead for now and shows no signs of a plot.
If you like it follow him otherwise you already know that it doesn't make sense to continue following him. ^^