It takes place in the first episode, but instead of Ais saving Bell from the Minotaur, Bell sees a stone that was next to him, and throws it directly into the Minotaur's eye, and by contrast, blinding it running away from the minotaur, Bell starts running without stopping to try to escape the Minotaur, while Ais follows them a little behind, Bell trips and falls into an abyss, while Ais catches up to the minotaur and kills it, but sees that the boy is not there.

Bell did not die, but as a consequence, he lost all his memories, and now he is in the deepest floors of the Dungeon, and he fights for his survival, trying to remember his past, looking for the remains of his soul, which are fragmented over time to fall. Meanwhile, Hestia asks for a search team for Bell, but no one accepts, as it is impossible for anyone to have survived that abyss so she had her familia look for him, and Ais also blames herself directly for the event even though she was from a different familia.