'Ah, subarashiki nyansei' au!

Rui is black cat tramp guy, he used to be on the street, he never had a master, he lived on his own, but one day, Rui passed by the windows of houses, and saw another cat boy, he had white ears, blonde hair, and amber eyes, this boy was so cute, He was looking at the moon, and did not even notice that Rui had come up