Fantasy Roujin Home Baruhara Sou, The Royal nursing home for the elderly "Walhalla-so", ファンタジー老人ホームばるはら荘, 退休老干部瓦尔哈拉庄园, Fantasy Roujin Home Valhalla-Sou
To take revenge for her grandfather, Marie, a descendant of the demon lord, infiltrates a retirement home where former heroes and other esteemed persons gather.