Yuuta Hasegawa, a second-year college student, was dumped by his girlfriend on Christmas Eve. While heartbroken, his mischievous junior, Mayu Shinohara, continues to visit his home, teasing him relentlessly. Despite her usual antics, Mayu is concerned about his depression and prepares meals for him, taking care of him when he comes home drunk. She confesses her desire to make him fall for her, revealing a softer side only he sees. Their interactions are filled with playful banter and subtle affection, hinting at a budding romance.