Kuroneko ni Amagami

Suzu is a college student who started living alone because her parents remarried. At first she has a positive attitude but gradually the feelings of loneliness catch up to her. In comes Kyuuta, the landlord living downstairs, and his younger brother Touwa, who comfort Suzu's heart.

In Kyuuta's apartment there are also many books by "Ichijikunagi", Suzu's favourite novelist, and the two bond because of it and slowly become more aware of each other.

Will Suzu notice the true identity of Kyuuta?

(Source: Shogakukan, translated)