Suddenly whisked to the magical world of Twisted-Wonderland, high schooler Yu wonders why he was even summoned. He has no magical abilities and is not even from this world. All he wants is to go back home, but he comes face-to-face with a fire-breathing monster instead.

The residents of Heartslabyul House are growing increasingly unhappy with their housewarden's strict rule-abiding ways. Meanwhile, Ace must find a way to convince the housewarden to remove the collar around his neck.

Yu is given special permission to live and work at Night Raven College while he searches for a way back to his own world. Things seem to be going well for Yu as he settles into his new environment, until a familiar monster reappears with its fiery temper.

Ace barges into Yu and Grim's dorm late at night, wearing a strange collar. Following Yu's suggestion, they head to Heartslabyul House the next day, but a surprising encounter in the renowned rose garden thwarts their plans.

To reverse their expulsion, Ace and Deuce head towards the abandoned mine with Yu and Grim to search for a magestone. Just when they thought they were alone in the mine, a terrifying voice echoes from the depths of the darkness.