A diligent girl named Misato who plans to enter the engineering department to help her parents in the future. A pure and innocent virgin with only one past partner, she challenges herself with her first mat play session. Overcome by the thrilling excitement of new sensations, her pleasure steadily builds. Though she originally intended to learn various dominant techniques, she soon finds herself overwhelmed by her own arousal, climaxing repeatedly. Before long, she passionately begs, "Come inside me," leading to three consecutive creampie sessions. Reflecting on the experience, Misato says, "I never knew sex could feel this amazing♪." Through this first-time encounter, she discovers new emotions and overwhelming pleasure—the sincerity of her feelings and openness to new experiences make her truly captivating.