Kazuhiko, your childhood friend and irreplaceable best friend. And Anna, his lover. you was drawn to her, not knowing she was his best friend's girlfriend, and ended up kissing her.
"I'm saving my first kiss with Kazuhiko for our wedding." She maintains a platonic relationship with him, but her true desire is—
"I'm trash... Betraying my boyfriend's pure love gives me the ultimate pleasure."
A devilish trap, carefully laid. Stealing moments behind your best friend's back, you cross the line with his lover, a girl he's never even held hands with. A muddy game of chicken, where you slam the accelerator toward mutual destruction, now begins.