Okashi na futari (okaue ai) manga

Okashi na Futari (OKAUE Ai) summary:

From Summer Rain: Akamatsu Taichi aims to be a shoujo mangaka. Despite being the heir to a large enterprise, he moves out and begins to live alone in a run-down apartment. One day, Taichi was asked for help by a girl who lives in the next room - a girl named "Midori". A scramble of friendship and love - a sweet romantic comedy!