The Miho Toono family moved to an upscale residential neighborhood so their daughter could attend Aoyama Gakuen Elementary School. Feeling uneasy about the new environment, Miho one day met Aian Hanasaki on her way home from picking up her daughter at kindergarten. Learning that Aian's eldest child also attended the same school, Miho naturally grew close to her. Soon, the two began visiting each other's homes, deepening their bond. One afternoon, as Miho relaxed at home, Aian leaned in close and whispered obscene words into her ear... igniting a new, intimate relationship between them.