An adventurer's guild "Amakakeru Oyou" (天駆ける雄羊) operates from a pub in the outskirts. The Guildmaster cum pub owner Neil and his daughter Lusit run the businesses. This guild is now faced with an existential crisis.

The remote town of Dantor is situated on the foothills; it was formerly a massive mining complex run by the dwarves, but with their disappearance the town is now a hotspot for adventurers looking to get rich quick from what is now an enormous underground labyrinth. Amakakeru Oyou was but one guild which kept the mass of ambitious adventurers in control, but the retirement of capable adventurers and the rapid rise of the formidable rival guild, "Kokuyou no Tora" (黒曜の虎) has contributed to Hitsuji running at a loss in recent times.

Everything came to a head the previous month when the notice revoking the business license was delivered to the struggling guild. The town of Dantor only permits officially licensed guilds to operate so as things stand Oyou is on the verge of collapse. To renew the business license, Oyou has to produce tangible results within a few months.

During this time of crisis, the leading guild breadwinner, the skilled warrior Edgar, has his strength drained by a mysterious monster whilst exploring and is severely weakened to the point he cannot continue his trade. For the remaining guild members, this disaster is the last straw precipitating their exodus. Edgar remains as the sole registered adventurer of Oyou.

At this juncture Lusit offers Edgar the position of new Guildmaster. Lusit's reasoning considers her father's advanced age and the effect of having Edgar with his fame as a skilled warrior take the reins, which would encourage young adventurers to gather at the pub. Edgar, who still had lingering regrets over his career-ending accident, thought about his present physical condition and his desire to pay back the guild which he had grown fond of and decided to take up Lusit's offer to become the new Guildmaster of Amakakeru Oyou.

And thus, the ex-adventurer Edgar begins his new life as a Guildmaster.

[Translated from official website]