Ken defeats the Monster of the Week without transforming into Five Blue to teach his students that regular humans can overcome their limits.
The second episode, with a slight Crowning Moment of Heartwarming tossed in, whereas Ken lost his patience over waiting to strike the enemy against Arthur's advice and goes Leeroy Jenkins, followed by every other siblings except Gaku. Arthur is visibly depressed, wondering where did he go wrong in raising the Hoshikawas. Then Gaku cheers him up and assured him that he did the right thing... Then cue Ken's plan blundering and nearly costed the lives of him, Kazumi, Fumiya and Remi... and then Gaku rushes in, with machine gun blazing on his hands, all just to save his siblings his siblings that just disapproved his method before. And he does that unmorphed too.