The apartment opposite Yamazaki, who works part-time as a cram school teacher... Could such a coincidence really happen? Nanami, a student of his from when he was a private tutor 8 years ago, lives there. From the window of his house, he can see Nanami defenselessly. He spends his days secretly gazing at Nanami, who has become a married woman and exudes adult sex appeal. One day, when he was beginning to feel a sense of emptiness, he helps Nanami from a purse snatcher and the two of them become closer again...