Doom slayer male reader x Genshin harem

Y/N was a normal college student but 5 years ago that would change. Ever since demons invaded Earth 5 years ago the demons killed his parents, siblings, his pet dog, and his friends they all suffered and i suffered during this but then eventually someone called the doom slayer Destroyed the demon army. After the invasion Was over everything was back to normal but one fateful day that would all happened again.