Kenji, a high school student preparing for college entrance exams, asks his high-achieving, beautiful sister-in-law, Asami, for study tips. Kenji, who has been solely focused on studying and hasn't had much interaction with women, finds Asami's beauty overwhelming. Just sitting next to her makes him lose focus on his studies. Seeing Kenji's inability to concentrate, Asami takes the initiative and says, "I'll teach you more than just studying." This is a dream first-time experience for Kenji, where his high-achieving, perfect sister-in-law with her amazing pussy accepts him whenever his cock gets hard, helping him graduate from his virginity.