Under Haruka's control, Hibari knocks out Kiriya and steals the Yang scroll. The next day, Haruka appears before Hibari and retrieves the scroll from her, saying she will most likely be labelled a traitor by the light faction and should join Serpent Academy. Feeling she needs to do something, Hibari decides to go to Serpent Academy so she can retrieve the scroll, leaving a note behind for the others. When Yagyuu learns of this, Asuka stops her before she does some rash, assuring her that she is not to blame. Meanwhile, Hibari arrives at Serpent Academy, where she is enrolled as a student and learns how Homura and the others came to join the dark faction. She is also introduced to their teacher, Suzune, which rings a sense of nostalgia to her. As the Hanzou Academy girls try to determine the location of Serpent Academy, Yagyuu mentions to Kiriya about how Asuka was able to dodge her attack. Later that night, Suzune appears before Kiriya and challenges him to a duel, revealing her identity to be Rin, his former student who was presumed dead. She leaves him a map to Serpent Academy, saying she will be waiting for him there.

Having overheard Kiriya's conversation with Rin, the group make plans to travel to Serpent Academy, with Hanzou giving his approval despite Kiriya's concerns. Meanwhile, Hibari attempts to locate the stolen scroll, where she overhears Rin speaking with her leader about her plan to lure the Hanzou Academy girls in order to utilise the power of the Ying and Yang scrolls, which is seen as an act of betrayal. As the Hanzou girls set off, Kiriya and Daidouji decide to follow after them. As Hibari asks the other girls how they feel about their teacher, she gets the feeling that they're not bad girls at heart. Later that night, Hibari listens in as the other girls are informed of Rin's apparent betrayal and are instructed to eliminate any intruders, with their lives at forfeit should they lose due to a forbidden art placed upon them. However, Hibari is caught by Haruka and locked up alongside Rin. Meanwhile, the Hanzou girls begin their infiltration, with Yagyuu managing to use Hibari's scent to locate the secret entrance to the academy, coming face to face with Yomi.

The Shinobi Masters tournament has begun, but is Naked Dodgeball really the best way to determine the ultimate shinobi?!