I'm a college student living in a rundown apartment with no clear future... One day, while I was spending my days attending college without any dreams or hopes, Rio moved into the room next door. I was Kokoro to her woman with her bell-like laughter and childish appearance, but with a mysterious aura... She always tried to seduce me. I couldn't resist her sweet whispers that melted my eardrums, so I just did as she said, and before I knew it, I was drowning in sex with a married woman.