「Dungeon Killer. Your explorer qualifications are hereby revoked.」

「…Huh?」

Dungeons were once feared by people as nests of monsters.

However, in recent years, with the resources slumbering within them gaining importance, people began to seek coexistence and co-prosperity with dungeons.

As a result, Lect, the 'Dungeon Killer'—an explorer who had until now destroyed countless dungeons through 'complete clearing'—was cast aside by nobles profiting from dungeon management and expelled from the Explorer's Guild.

Lect, having retired from active duty, decided not to wallow in self-pity and, concealing his true identity, ended up serving as an instructor at a dungeon training school introduced by an acquaintance, but…

「Why is the training school instructor so strong!?」

At first, the students looked down on Lect, who had retired at such a young age, but before they knew it, they came to idolize him,

「Because you retired, the dungeons are becoming more active!?」

「Coexistence and co-prosperity with dungeons is impossible!! The higher-ups in the country don't understand!!」

He was pleaded with to return to active duty by explorers who knew the field well, among other things, making it seem he won't be able to live peacefully just yet.

Noble conspiracies. Changing dungeons.

Lect, now free, makes appearances on a whim and influences them.

This is a tongue-in-cheek after-story about a hero who, believing his role is over and seeking peaceful days, unwittingly continues to have a great impact on the world.