Otona no Zukan Kaiteiban

With those words, Souichiro Kudou's life was changed forever. Suddenly, he has a four-year-old daughter named Kiki, thanks to his late friend Haruki. And it only gets more complicated when he proposes to a total stranger... Husband, lover, father, and friend—only time will tell whether Kudou can reconcile his past with Haruki and learn to fill these roles for the new people in his life. Luckily for him, Kiki and his new spouse, Fusako, are ready and willing to figure it out alongside him!

(Source: Yen Press)