GTO: The Early Years Vol. 14 (manga)

Before the GTO made his mark on the Japanese educational scene, there was another legendary teacher from Shonan and she could motivate her students in ways most school boards have never imagined. Using all of her assets at her disposal, Nao Kadena will raise GPAs, and pulses, by teaching her Tsujido High kids the ABCs and much more with her Ts an A.
Finally, a reason to go to school...Ms. Kanade's unique brand of physical education