Just graduated from university, the young student immediately moved to the city to find a boarding house. Unfortunately, his place was right across from the lewd neighbor Akagi's house. Due to the only separation being a glass window between the two houses, everything the neighbor did could be seen by him, including provocative actions like rubbing her breasts and buttocks against the glass, or the times she masturbated. One day, when the urge reached its peak, she directly called him over and continuously teased him to have a discreet affair with her while her husband was away. Because of what he had seen before and at this age, he was eager to explore mysterious things, so the young male student easily agreed and helped her reach climax in a very short period of time.