毎晩向かい部屋から聞こえてくるケモノのような喘ぎ声ー。大学生でひとりマンションに住むトミフミは毎晩聞こえてくる喘ぎ声と、エアコンが壊れたボロボロのマンションに嫌気がさしていた。しかし、ある晩ふと向かい部屋を除くと、人妻の里帆がこちらを見ながらオナニーをしていた。地味ながら優しさ溢れる天使のような素顔と、天然のフワフワなGカップ…。思わずトミフミが見とれていると、里帆に部屋に来るように誘われてしまい…。

Every night, animalistic moans could be heard from the room across the hall. Tomifumi, a college student living alone in an apartment, was fed up with the nightly moans and the dilapidated apartment with its broken air conditioner. However, one night, when he happened to peek into the room across the hall, he saw Riho, a married woman, masturbating while looking at him. Her plain yet gentle, angelic face and naturally soft G-cup breasts… Tomifumi was so captivated that Riho invited him into her room…