I'm just an ordinary college student living alone in an apartment in Tokyo. My neighbor is Yuna-san, a married woman who is plain and unsociable despite having a stunning figure. One day, I accidentally caught a glimpse of her flashy lingerie while taking out the trash. That gap wouldn't leave my mind, and I gradually started becoming interested in her. Then, I noticed that unknown men were constantly coming and going from her room... To find out about the "secret job" I heard about from the building manager, I gripped 20,000 yen in my hand and headed to Yuna-san's place...
