After finally getting his first girlfriend, a virgin realizes he has no idea how to date or have sex, so he asks his childhood friend Sumire for help. She shocks him by offering to take his virginity before his girlfriend discovers his inexperience. They practice sex, blowjobs, cunnilingus, and even creampies—until he finally understands the truth: the woman he loves is Sumire. The twenty-first entry in the hit youthful romance series.