Mugen Tenshou: Ryuuki to Kotora to Sengoku Zombie

Kotora Takeda is the daughter of the proprietor of Izakaya Fuurin Kazan, while Ryuuki Uesugi is the son of the owner of the Echigoya liquor store. For over four hundred and sixty years, their respective families have been locked in a bitter and unyielding rivalry, clashing repeatedly in the historic conflict known as the Battle of Kawanakajima Island. What began as a fierce commercial and territorial dispute between two prominent households has endured across generations, shaping the lives of both Kotora and Ryuuki into steadfast adversaries bound by centuries of inherited animosity. However, the long-standing feud is abruptly interrupted when an unprecedented threat emerges. A terrifying army of zombies suddenly descends upon the island, plunging the region into chaos and endangering everything both families hold dear. Faced with an overwhelming supernatural menace that neither faction can defeat alone, Kotora and Ryuuki are forced to make a difficult choice. Setting aside more than four centuries of deep-rooted family grievances, the two rivals forge an unlikely alliance. Together, they must unite their strengths and fight side by side against the undead horde to protect their home from total destruction.