In a unique fusion of eras, from ancient matchlocks to modern cellphones, a tale unfolds in a contemporary setting with an unexpected twist—an 'Inner Palace' residing within Osaka Castle! Hidekage, the sole heir of the Toyotomi Shogunate, embarks on a mission for the inspection bureau 'Carrion Cafeteria - Vulture,' delving into a harem where a bevy of beautiful girls are gathered. To his surprise, these girls engage in staged battles behind a glass case, resembling an aquarium. These are no ordinary maidens! Thus begins an unparalleled and forbidden journey into a school life like never before imagined.