Destined Constellations (Male Reader x Urusei Yatsura

Y/N have a joyful personality (just imagine Dante from Devil May Cry), he are not from Japan. Considering he has moved when he was 14.
Then he met a teenager Moroboshi Ataru. Y/N has been freind with Ataru since he was entering middle school. But one day, a invaders from planet Oniboshi came. How the story would go?

Read this fanfic then.