After experiencing troubles in her marriage, Aika moves back into her family home along with her baby. Takuya is already living there, creating a tense and close-quarters domestic situation. As a nursing mother, Aika regularly breastfeeds her child, a natural act that Takuya finds himself accidentally witnessing. His stepsister is also described as someone who is not particularly modest about her body.
: Aika returns home to raise her two sons while her husband is away for work. ane wa yan
: A Japanese portmanteau combining "Yankee" (a Japanese subculture term for rebellious youth, delinquents, or people with bleached hair and sharp attitudes) and "Mama" (mother). A Yanmama refers to a young, fashionable mother who still carries the stylistic traits or rebellious flair of her teenage "Yankee" years. After experiencing troubles in her marriage, Aika moves