As for Kenta in this episode, I find his sudden interest in Seira a bit weird considering that in one episode, he had a love interest but decided not to pursue her now because of his mission as a Maskman. It feels like he is a being out of character when he fell in love with Seira in first sight. Even if that's the case, I kinda ignored it because of the episode's drama. The drama portions of this episode are the best parts of the episode that I forgot that this is a superhero show until they show us some fight scenes.
After Seira died, the scene is then followed with the standard "I will not forgive you, Tube!” the fight scene ensues, MOTW is defeated and the giant battle. Nothing much to talk about except that Great Five is back. Oh well, at least they didn't forget that Great Five still exists and is treated as Galaxy Robo's equal rather than given the treatment as the weaker first team mecha like how most Super Sentai mechas do these days. At the end, Kenta silently mourns about Seira's death and is later comforted by his friends.