While peacefully visiting a temple thanks to Rias' spell, an attacking group of local youkai breaks the calm atmosphere. The group soon embarks on a school trip to Kyoto. After rescuing his master, Rias Gremory, from the Dimensional Gap, Red Dragon Emperor and aspiring Harem King Issei Hyoudou can finally return to his high school activities alongside fellow members of the Occult Research Club: Yuuto Kiba, Asia Argento, Xenovia Quarta, and Irina Shidou.