Honkai Impact (op male oc x harem) 18+

Kami is an employed worker who have normal life. While he is looks like human from outside but inside, he is something more. You see, long ago there was a light came from the sky and revealing them that they are aliens. These aliens are known as "Saiyan race" who is a warrior came from Planet Sadala. Well, that was when before the extermination of their race or so thought. Kami here was a last kind of their race and he will do what necessary to protect the Earth.

So then, one day, Kami went back home and started to play his at least favorite gacha game, Honkai Impact 3rd. While he was playing it he saw a weird setting and the phone started to shake.