i really loved this anime and wish the light novel would get picked up, its just sad to see something like this not get the attention it deserves. it is by far the best harem anime ive ever seen, it doesnt even feel like harem, but just a group of friends where one of them brings along her brother. every feels like real people rather than just some trope for the checklist.
This one has a manga adaptation now. I am 10 chapters into web novel and its pretty nice. So far it has not been like super smutty. Adult yes, but the adult act is not the main purpose of the writing but more like a cherry on top of a cake.