Maryoku o Tamete, Butsuri de Bunnaguru: Hazure Skill da to Omotta Sore wa, Aratana Kanousei no Hajimari deshita

Kento threw himself into the adventurer business in order to fulfill his sister's dream. He turns out to be a rare sage with a unique skill called "Fate Reversal". (Source: Natalie, translated)