This is the story of Yuuya Toba, a somewhat diligent heir to a distinguished family, and Mizuki Fushimi, who seems like an elegant and untouchable goddess, but is actually the friendly and fun-loving friendly type. These two engaged childhood friends have been semi-cohabiting since they entered high school, and are so close that they're often called a “married couple” by those around them. However, despite knowing each other so well, they become too embarrassed to even hold hands when they start to consider romance! “““…Being 'more than a married couple, but less than lovers' somehow doesn't sit right with me!”” Fueled by this realization, the two embark on a journey to accumulate experiences that make them seem more like a couple! This is the story of an unwitting, silly couple as their romantic relationship progresses to the “next” level.