Oniichan dakedo Ai sae Areba Kankeinai yo ne!

After years of living apart, Akito and Akiko Himenokoji are finally reunited in a school dormitory. Akiko hopes to keep her brother's attention entirely to herself, but their new home is already full of forceful personalities.

Student-council duties, rival claims on Akito's time, and his own concealed writing work turn the reunion into an unruly shared life. Maintaining ordinary sibling boundaries proves difficult when everyone around them has a different idea of how the household should work.