If you're looking for manga similar to K no Souretsu, you might like these titles. All recommendations are made by Anime-Planet users like you!
All Sabato Obiga wants is to have a girlfriend, but his bizarre and death-obsessed family always seem to get in the way. Though Sabato himself has regular interests, the Obiga family is another story: they love anything black; decorate the house with skeletons, gravestones and spider webs; and always seem to scare away any potential leading ladies. Sabato begs his family to act normal, but they refuse to change who they are for anyone... a trait that Sabato is sorely lacking.
Haunted House and The Funeral Procession of K are josei series about a "normal" dude in a house full of odd people (many of who are obsessed with death). The artstyles are extremely similar- grays and screentones are rarely used, so there's a striking contrast between the black and white. Each also has a gothic lolita-ish look.
Another manga about a guy that's recently moved into a hotel/apartment, and everyone else staying there is completely outlandish. Most are weird in a creepy/macabre way.
Voynich Hotel is fairly normal in terms of art and storytelling method, whereas K no Souretsu is just as odd as it's cast, but if you liked one you may want to look into the other.