Konosuba Light Novel Vol 16

In the wake of the chaos wrought by Selena, Aqua runs away from home,leaving onlya note behind...bearing a request to chase after her. Witheveryone's favorite mascotnowhere to be found, the whole of Axel descendsinto tumult. However, with Kazumahaving reverted to level one, there isn'tmuch he can do to help.

That is, until Megumindrags him off to do some GiantToad hunting and he gets a power up so crazy it'sbasically cheating. It'stime to get off the couch and chase after that runaway goddess!