As a descendant of the famous monster in the Book of Mountains and Seas in the flower-growing country, he was forced to leave his parents and go to an unknown world due to some accidents.
It fell into the famous city with the highest crime rate in country M (although the heroine didn't know it). Fortunately, a good man picked it up and took it home.
Although getting along with each other was not very friendly at the beginning, fortunately, the process after that was not too bad.
In fact, generally speaking, the heroine had an accident in the original world and was sent to other worlds by her parents. Then she spent all her demonic power to change back to her original form and was seen by the master, so she was brought home (for study). Later, he was adopted by the master, and in the process, he helped the master raise four little birds.
CP is possible, cough, I just said it is possible, it is Jason AKA Red Hood AKA the second generation Robin
Main DC, and then maybe traveling to other worlds