High school student Shota attends tutoring sessions, but instead of focusing on his lessons, he can't keep his eyes off his instructor, Sayuki Kanno. He's completely captivated by her massive J-cup breasts. During class, Shota routinely pulls out a mirror under his desk to peek up her skirt and plays mischievous pranks on her. He's bold enough to show up at her house uninvited for overnight stays, and even sneaks secret sex with her during class while hiding from other students. Shota's innocent curiosity and shameless antics make the story all the more exciting.