Kaori, the tennis club's ace, has just gone to see her kohai, who hasn't been around lately... When her boyfriend Masaya takes Kaori to Ami's house, Ami is worried, but what she sees... is Ami with a man's cock in her mouth. Kaori is attacked by Ami's friend Ryo and loses her virginity. She calls out to Masaya for help, but his voice doesn't reach her... Ami's stimulant increases Kaori's sensitivity, and she falls into a pleasure she's never experienced before...!