Matsushita Ukyou is typical mama’s boy. One day, he receives a call from his grandmother, Chichiizumi Touka, asking him and his mother to visit the Chichiizumi Shrine, where she holds the title of Milk Shrine Priestess. However, it turns out to be more than a simple call when the priestess announces that she will be retiring! Ukyou must perform the chichi miko training with three beautiful women, his mother, aunt, and cousin, and determine which is fit to succeed as Milk Shrine Priestess!​