Sakura Aoi, Madoka's older sister, possesses a kind-hearted nature. She treats the house guest Kousuke with maternal care, offering him unwavering support. Her deceased husband bore a striking resemblance to Kousuke, creating profound internal turmoil. Despite her widowhood, Sakura continues wearing her wedding ring as a symbol of enduring devotion. This resemblance complicates her interactions with Kousuke, making it difficult to quell her attraction. Her situation escalates when Madoka, witnessing Sakura's closeness to Kousuke, grows intensely jealous, fueling tension within their family dynamic.