I just realized this after @Asbolus said he had no idea on where the plot went: him dying beforehand, a last chance to not be sent to hell, all the suffering he has to go through and him barely even repenting or changing his ways... guys, this is not some simple isekai nursery, this is purgatory.
Nah it's one of those "there is no magical artifact it was the journey that gave you what you desired," kind of deals. Or not, but that's the vibe i'm getting.
The tadpole becomes the king of the dungeon , I guess you can say : It is reigning frogs in the dungeon . Lol , the pun here is that "reign" and "rain" have the same pronunciation . It is raining frogs in the dungeon .