A Shinobi Classroom Retrospective - S1.E8

For most of this episode, we see flashbacks. Each to which flashed back to when all 5 of the girls first joined the Academy. We find out how Katsuragi teaches Ikaruga to open up. And when Asuka first joined, she appeared to be just an amateur, but eventually began showing promising signs. Finally, there was a flashback to when Yagyuu and Hibari had first joined. Once the flashbacks ended, Suzune and the mysterious leader of the Serpent Academy continued to discuss plans to obtain Hanzou Academy's Yang scroll. At the end of the episode, the pin that Haruka gave to Hibari begins to glow, and it appears as though Hibari may have become Haruka's puppet.