Synchro

Keita had some new issues with Kuro, regarding the concept of Synchronization as he felt his entire life had changed after Kuro created the pact. It was until the encounter with Keita's teacher and covert Tribal End agent, Tsubota-sensei, that Keita realizes that Kuro was right all along and thus teamed up with her to defeat him after Tsubota initially gains the upper hand against Kuro due to issues of synchronizing properly with Keita. The two escape from school, leaving an unconscious Tsubota behind after Kuro was able to incapacitate him by sychronizing together in order for Kuro to use her Exceed abilities against her opponent.

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S01E04 - Pursuer