One moment, Kanami finds himself in a dark labyrinth filled with fierce warriors and monstrous creatures after visiting his sick sister in the hospital. In this deadly 100-floor dungeon of a fantasy realm, he discovers that reaching the bottom grants a wish. Equipped with newfound magical abilities and an enigmatic skill that activates in dire situations, Kanami struggles with its unsettling impact on his psyche. As he garners the interest of a cryptic girl, he realizes a chance to reunite with his ailing sister back in his world. However, the question lingers–what sacrifices must he make to grasp this opportunity?