Following Ulrike's word, Yuri and the others of the Great Demon Kingdom decide to go to Earth in search of the fourth box, "The Bottom of the Mirror."  Yuri's parents welcome the party who safely (?) arrive in the Shibuya family's bathtub. His parents are unfazed and don't even ask Yuri for any explanations about this unusual situation - Miko rejoices in reuniting with Conrad and Shoma congratulates Yuri for having become the Demon King! Everyone is enjoying their stay on Earth, except for Shori, who is mistrustful of the group for deceiving Yuri and putting him into danger. And then, they head to Switzerland in order to obtain more info on the whereabouts of the "Bottom of the Mirror" from the Earth's Demon King, Bob.