Rio, who previously had a complex about being bad in bed, starts dating the super shy Shintaro! Having decided to go on a hot spring trip together, Rio thought she'd have to take the lead in bed with the sexually inexperienced Shintaro...However, when things come down to it, she soon finds herself losing her mind at the subtle tenderness of Shintaro's touch. She feels herself tingling and writhing in pleasure almost to the point of orgasm while never actually being allowed to come. When she finally can't take it anymore and says something to him,and he makes her come over and over again, drowning her in a sea of ecstasy! After such an experience Rio is convinced that she'll never be the same again…