Ep 16 – “A Promise From the Heart, The Secret Sword Technique of Shiden” / “Yūki Aru Chikai! Moeyo Hiken – Shiden no Tachi” (勇気ある誓い! 燃えよ秘剣·紫電の太刀)

Toma was a former student under Sasaki. Ultimately, the Jinpuu squad is taken down and Toma repents to his former master.