Author: Kuze Gaku https://mangadex.org/search?author=Kuze Gaku Genre: Comedy, Fantasy, Slice of Life Theme: Demons, Supernatural Description: The story of the Devil who picked up an Angel's child. https://mangadex.org/title/41355/kimi-ga-futte-kita-hi
Yeah i just read the two first chapters in aggregator site. I think it is pretty cute n heartwarming as short series. But cant be anything like masterpiece or awesome, as it lacks strong backstory n the premise isnt that promising to be made as a long series. In the other hand if ur looking for sth cute heartwarming that really promising n masterpiece candidate try : Spy x Family