Serious and hardworking plain girl Rion devoted herself to studying every day. One day, she suggests studying alone with her first-ever boyfriend in her room. As they study together, he drops his pen on the floor and bends over to pick it up. In that instant, his eyes lock onto the panties peeking out from under Rion's skirt. Overcome with excitement, he can't focus on studying anymore and pushes the shy girl down onto the bed. Finally, the moment has arrived. Rion, ready to accept what's to come, whispers, "Let's study something school never taught us today, just the two of us," and gently pulls him into her arms.