Kotora Takeda is the daughter of the owner of izakaya Fuurin Kazan. Ryuuki Uesugi is the son of the owner of the liquor store Echigoya. For over 460 years, these two factions have participated in the Battle of the Island Kawanaka. But one day, an army of zombies appeared. Kotora and Ryuuki decide to put aside the family disputes and fight against zombies.