The Grand Isles is a world filled with large islands. Centered in these islands is the royal capital of Freesia, where humans and demons coexist. Since angient times, humans have viewed demons with disdain, discriminating them for their vulgar appearance and inferior abilities, but not anymore. The king of the current era made it his mission to rectify the wrongs of the past and do away with discrimination and prejudice. However, it will take a lot of work and time before humans and demons can live together in peace and equality.

In the trade city of Marigold, a spirited woman is setting off on her grand adventure. Her name is Lilia Flores. She’s working as an adventurer to explore dungeons and save up money to fulfill her dreams. However, Lilia isn’t someone with amazing athletic abilities or powerful magic talent. Facing failure after failure, Lilia continues to keep her head held high, positive that her next adventure will be better than her last. The daring Lilia sets off to a dangerous dungeon where a rumored expensive magic stone lays hidden.

Meanwhile, in the royal capital of Freesia, a royal knights called Sheryl, who is working tirelessly to bring peace between humans and demons, receives an order: To investigate the recent demon disappearances. After finding a lead about a suspicious individual who has been frequenting the dungeon, Sheryl deduces that humans who have a deep grudge against the demonic race may have captured the missing demons! Bidding farewell to her lover and housemate, Roy, Sheryl ventures forth to investigate this case on her own.

What will happen to Lilia and Sheryl when they meet in the depths of the dungeon? Can these two women, with their vastly different backgrounds and personalities, help each other escape the dungeon?