From Girls' Generation Scanlations:

After having been apart from his older brother for 10 years, Ninomiya Michiru, has finally returned to Japan to live with his brother, Shiou. But what surprises lies in store for him after all these years? What secrets were buried in his memories after all these years that he tried to forget?

Series Chronological Order [Pairing # : Volume #]
Nekoka Danshi no Shitsukekata [1:1-5]
Nekoka Kareshi no Ayashikata [2:1]
Ikezu Kareshi no Otoshikata [3:1]
Kuroneko Kareshi no Asobikata [4:1]
Kuroneko Kareshi no Amaekata [4:2]
Kuroneko Kareshi no Aishikata [4:3-4]
Fukigen Kareshi no Nadamekata [5:1]
Kuroneko Kareshi no Afurekata [4:5-6]