My Isekai Life 11 (manga)

Yuji was hired as a scout to accompany a group of adventurers on a slaying quest to take down the dreaded Luisia Rhino. After stumbling on the fearsome foe, who ends up being far stronger than the target they were hired to take down, Yuji ends up accidentally showing off his true power to protect the group. Just when things start to get dicey, however, he notices something odd about the Rhino that has him questioning the monster’s sudden appearance...