Oniichan dakedo Ai sae Areba Kankeinai yo ne!

Synopsis

After 6 years of being separated, Akiko Himenokouji has arrived at the doorstep of Saint Liliana Academy's Student Dormitory to be reunited with her brother, Akito Himenokouji. Akiko moves in with him as they are attending the same school, but Akito is taken aback by Akiko's brother complex which has developed from being separated from one another. Looking forward to living alone with her brother, Akiko was peeved because of the other girls—Anastasia, Arashi, and Ginbei—moving into the same dormitory. All of them happened to be members of the school's student council. During dinner, the girls argue over who would have the privilege to sit beside Akito.

(Source: Wikipedia)