A series where sisters who wore gym shorts as active students confess their past erotic acts. This time it's Shinse-chan, a beautiful sister with G-cup breasts that can be noticed even over her gym uniform. She says she wore gym shorts until third grade in elementary school and continued to use them as underwear under her school skirt uniform up until ● high school. She talks about the lewd acts she secretly did while wearing gym shorts, becoming engrossed in gym short play.
