Boy From the Past, Part 1 - S1.E20

The boy named Sawada Haiji has put an end to the temporary peace. He was one of the middle school students that Masayoshi had lectured as Samurai Flamenco. Haiji declares that he is Masayoshi's last enemy. He then proceeds to attack the Flamengers, Kaname, and other people who are associated with Masayoshi.