The series takes place around the same time as DanMachi Volume 7, several days after the War Game.
This is the Labyrinth City Orario. It possesses the only underground labyrinth in the whole lower world, and thus has prospered from it, coming to be known as the "Center of the World". Ryuu Lion, under the owner Mia Grand, worked daily at the pub Hostess of Fertility alongside her coworkers Syr Flova, Arnya Fromel, Chloe Rollo, and Lunoire Faust.
One day, a pair of Humans' voices shatters the peace of the store...
This is a fairy tale that won't be written down, the Story of Lion!