In START-204, a musician on the street in front of the station and a sweaty old man at a construction site become friends by exchanging bodily fluids through their saliva-covered tongues. (Aoi Nanase, START-204)

Aoi, who sings in front of the train station chasing her dreams, has lost everything and now works on a construction site, raising a child alone. She and Saito, a middle-aged man, two people who would never have met, find solace in each other during their brief time together, passionately kissing and constantly licking one another. This is a somewhat unusual pure love story between a middle-aged man and a mature, beautiful young woman, who satisfy each other's loneliness and sexual desires.