Daichi-kun, a second-year college student, finally lost his virginity after getting his first girlfriend and successfully navigating his college debut. However, after two years of dating, his current concern is premature ejaculation! Could it be due to his long period of abstinence and overstimulation? His girlfriend even complains, "It's like you're the only one who's enjoying it and it's over!" He confides in his childhood friend Mina, whom he's known since kindergarten. Mina, with a playful streak, takes advantage of the situation, using the excuse of helping Daichi improve his premature ejaculation to indulge in controlling his orgasms!