"this wasn't supposed to happen." after a single mission failure, amatsuki, who was ambitious, was demoted. assigned to a rural area far from any 'incidents,' amatsuki was at a loss. there, she met a legendary former detective, officer oshima. one day, during an undercover investigation in the rain, oshima couldn't control his excitement seeing amatsuki's soaked body, forcing a hug and kiss. despite resisting, amatsuki felt something and ended up with him inside her. understanding it was adultery, amatsuki gradually filled her frustration and loss from the investigation with physical pleasure, initiating deep kisses, intense sex, and begging for creampies. emotions tangled, they indulged in each other's bodies, drowning in pleasure whenever they were alone.