Kishiryu Sentai Ryusoulger

The Seventh Knight (1x26)

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A man named Nada who comes from the Ryusoul Tribe suddenly appears before Koh. A long time ago, he was the senior student training alongside Koh under Master Red. He heard the rumors that the Druidon have returned from outer space and has come to join the Ryusoulgers in their fight. However, just then the city lies in a state of confusion after a Minosaur who strays people's kindness attacks. The Ryusoulgers rush to the scene, but discover that Koh has been taken down by the Minosaur's attack.