One step closer (genshin impact harem x OP male oc x crossover harem)

Toad is a very powerful interdimesional traveler. he travels through the multiverse protecting whatever world he visits. Now he's stumbled upon a completely different world, one that's unknown to him so he decided to check it out. The world he entered astounded him. it was primitive but advanced at the same time. he was lost for a short while until he came across 2 and a half girls. They led him to a nearby town called Monstadt and thus his new adventure begins with even more girls to add to his ever expanding harem.