Akari is the beautiful, capable employee everyone in the department talks about, making it surprising that she lives with an unimpressive coworker named Nakano. One day she is alone with her married boss in a reception room and suddenly whispers that oral sex does not count as cheating. He knows that accepting is wrong both as her supervisor and as a married man, but her seductive blowjob feels too good to resist, drawing them into a relationship balanced on the edge of adultery.