Isekai no Kyansera - Fuguu Shoku Demo Kyanseru Sukiru de Musou Suru (Novel)

A giant meteorite fell down to Earth and left it in ruin. But on the last day, “He” was casually playing a video game. The moment the Earth was destroyed he found himself in a world exactly like the game he was just playing. The job he had was the detestable job, “Canceller”. It’s main skill was only to cancel. But he, instead of falling into despair, with his pathetic skill in hand, decided to live in this other world and began his adventure. With enough creativity, his pathetic skill is actually the strongest? Go and rescue the slave girl! His cancelling tale is about to begin― Original Japanese Web Novel