Saiouji Kyoudai ni Komarasareru no mo Warukunai

Fuka had to take the job of a live-in housekeeper due to unforeseen circumstances. But it turns out to be the home of her mean classmate, Kairi! Moreover, the Saioji family consists four brothers who are nothing alike...? The oldest brother, Tsukasa, is calm and mature, the second boy, Akari, is an affectionate playboy, the third boy, Kairi, is a genius with a prideful temperament, and the youngest, Minato, is quiet and cute. The four brothers are each unique and handsome in their own way, and they're all living under one roof with Fuka!

(Source: Manga Park, translated)

Note: Chapter count includes six special and extras chapters.