Otona no Zukan Kaiteiban

Erotic manga author Kudou's friend Haruki passes away, leaving behind his young daughter Kiki and a note bequeathing her to Kudou. Strange as the situation is, Kudou commits to making a real family for the girl—so when he meets a woman who reminds him of his late friend, he fires off a marriage proposal on the spot! By blood, friendship, love, or circumstance, family is family...
(Source: Yen Press)