Meikyuu Toshi no Antique Shop

Meikyuu Toshi no Antique Shop summary:

A fledgling adventurer is depressed from his most recent, seventy fifth, failure to capture the third floor of the dungeon under Labyrinth City. In his unwariness, he is ambushed by a certain someone, and suddenly his life begins actually progressing again. From a life of bland rain to a life of colorful acquaintances he goes.
A series of short stories surrounding an Antique shop outside of Dungeon Gate.