"Does this feel good, Rei...?" Look, you can't stop leaking..." "We're really doing it... I'm about to have sex with a junior from work..." Rei Ayase is a collected type of girl who people always call "cool". Deep down, she longs to be feminine and fall in love... but before she realized, she was a virgin nearing 30 who was spending her days comforting herself in loneliness. Then one day, the friendliest guy at her office whispered in her ear with a serious gaze. "Could you show me your real self?" With her naughty side exposed, despite it being her first time having sex after dreaming about it for the longest time, she feels incredibly good...!! The barrage of love from her junior who has the sexiest gap in personality won't stop!