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Rivals from another dojo break into Ryōzanpaku to challenge their masters, but only with Kenichi and Miu present at the moment, they end up having to confront them by themselves.
Kenichi and Miu's homeroom teacher pays a visit on Ryōzanpaku to check on her living conditions, and the members of the dojo decide to forge a story to deceive them.
The dojo gang embarks on a vacation. But fun turns into fear when the masters issue a challenge Kenichi isn't ready to take.