With this power, he fights people being controlled by a similar item, the Dark Spark as Ultraman Ginga and with the help of his friends, Misuzu, Kenta, and Chigusa, they'll discover the secret behind these items and how their old elementary school becomes the center of this conflict that started in space.
It is also thanks to the show’s length that Tomoya’s supposed given dream of defeating Ultraman Ginga was forgotten in favor of him becoming more of a support character to Ginga via Jean-Nine. By the time second half started, we all just assumed that he changed him dream from wanting to beat Ultraman Ginga to fighting along Ginga. There was no proper transition into that status quo change. They just let the viewer assume that after the movie, Tomoya reconsider his life choices that instead of following a dream given to him, he’ll just follow his own.
If this project was meant to commemorate the 50th anniversary of Tsuburaya Productions, this is a poor way to celebrate it by limiting a project to its full potential. Speaking of limiting its potential, the mere fact that an 11-episode series was divided into parts with at least the first part of the second half of the series and the first few minutes of the movie being recaps limits what the show can do. You can do a good TV show in under 11 episodes, but in the case of Ultraman Ginga, this series doesn’t know how to use their limited run to its fullest
Finally, the series’ main protagonist, Hikaru Raidou, he’s pretty cool. His entire character arc in the series and in the sequel series, Ultraman Ginga S is that life is an adventure and the series shows us why is that. We learned that he wants to be an adventurer, something that was lightly explored in this series and in Ginga S. But him as an Ultraman? It took a while for me to accept that he is an Ultraman. The fact that we barely get to see him fight as Ultraman makes it even worse. Thankfully, they were able to solve this issue in the final arc of the first half of the series. More of him as Ultraman, he’s unique case as the series didn’t have iconic “Ultraman flying out of the scene after the battle” trope and barely featured a blinking Color Timer. The only time we saw Ginga fly out after a big battle was in the series finale and in Ginga S… and that’s about it. He an unconventional Ultraman for a new generation.
Thankfully, these concepts were further expanded in its sequel series, Ultraman Ginga S and its first episode is in my opinion, 10 times better than the first half of Ultraman Ginga. It also helps that it is 7 episodes longer than Ultraman Ginga, but that series is for another day.