If you're looking for manga similar to Nichijousahan Bi - Beautiful Life, you might like these titles. All recommendations are made by Anime-Planet users like you!
Yoshioka is a regular at Oosawa's restaurant, and always seems to be bringing in yet another boyfriend to enjoy Oosawa's delicious cooking. As a single parent, Oosawa works very hard and doesn't have time to make many close friends, or even consider dating. But when his beloved daughter Mizu falls ill and Yoshioka offers his help, Oosawa finds he must accept this frivolous seeming person's outstretched hand. Yet, sometimes people are not quite what they seem, as Oosawa discovers.
Both are BL manga in which one of the main characters is a single father. Also, while the situations are different, in both manga one guy helps out the other guy and that leads them into falling in love. Only Serious About You is the better of the two in my opinion, but if you like cute BL manga you should check out both.