There is also a prequel Someday I'll Fall for You Has been translated and sold English it’s 10 ch long. There’s a spot for it on Mangadex But there’s no chapters on it.
@Amaro thank you for finding/posting the missing chapters!
Very cute story, the little girl is adorable and her mom sure is an interesting character, and it's nice to see how those two guys' relationship developped in adulthood.
I still get sad everytime I'm reminded that in Japan queer people sometimes use adption to be able to be concidered family by the state - it's better than in still too many countries where it would be illegal to be gay, but still.