The 21st Erokyun private-sex documentary collects four highly sexed amateur women who reveal desires they normally hide. Ayu, 23, turns guessing her F-cup size into a striptease and seduces with sultry looks and a love of submissive men. Ama, 22, is a hardcore masochist who deep-throats through tears and gagging, then screams through hazy, overwhelming orgasms. Fumin, 21, is a sincere, inexperienced woman whose friend recommends an app, where she meets only the second man of her life. Carly, 22, brings matches home because she hates sleeping alone, clings to her date for cuddles, and lights up when she notices his erection.