Firstly I am super surprised that this is seinen. It's being told purely from the perspective of the female protagonist, and it deals with subjects like divorce, the ability to love again and the insecurity one feels when they are suddenly left alone, Quite a bit like the themes makoto shinkai explores I guess.
It's supposed to be about a story of how a woman is running what is essentially a host club, except instead of people pouring drinks in seedy bars, it's a bunch of cute dudes who go around sleeping with women who have anxiety issues. I do mean actually sleeping too, no hanky panky so far, and how just having someone to sleep beside you can help soothe you. It's really about the main protagonist though, and how she deals with a life after being abruptly divorced by her cheating husband, and how she deals with having to fill a hole that has been a big part of her life. The whole host sleeping thing was initially born from this idea, but so far there's really not much of a connective tissue between the two stories I feel.
Still, it could change. Now it's just a nice slice of life about a woman trying to rebuild her life.