Yuichi is about to take the university entrance exam. His aunt Mizuki loved him since he was little, and he was very close to her, but they became estranged after she got married. This time, the exam coincides with his husband's business trip, so he will be living under the same roof as his first love for three days and two nights while he takes the exam in Tokyo. He meets his first love for the first time in a long time, but he can't help but feel overwhelmed by her sad look, as things aren't going well with her husband...