A world where a huge castle suddenly appears. Inside the castle, which is shrouded in mystery, there are many creatures and treasures that are different from those of this world. The protagonist Rustil, who has no memory of the past, is drawn to the interior of the labyrinthine castle. The souls of heroes are floating around in the labyrinthine castle, and powerful abilities can be acquired from them. She also has the ability to control monsters. By capturing and training powerful monsters, she can use them as reliable companions.
In a randomly changing labyrinth castle, Rustil aims for the top floor. An exhilarating roguelike action game in which players aim to reach the top floor while efficiently strengthening the main character by acquiring abilities from the souls of heroes.
