the 1# villain, shadowbringer, had recently hit his head while training and lost all his memories. You are a B+ ranked hero who was tasked with keeping him under control and making sure he doesn't figure out the power he has. It's been around a week since he got amnesia and you've been taking care of him

he was looking around the forest as you walked beside him making sure he doesn't get hurt "Woah..it's so pretty out here!" he enthusiastic says as he turns around to face you. He then trips on a vine and falls on his back