Glossing over the things I can't spoil, the Grongi were the Rinto's rival race a gazillion years ago. The Rinto eventually won, and evolved into humans. In Kuuga, the Grongi are ultimately trying to eliminate the Rinto, but the humans the Rinto have evolved to are not match to their power, so Kuuga (who is a Grongi gone wrong of sorts himself) fights them to protect humans. Then there's the Unknown, who originally protected the Rinto from the Grongi, but now have their own agenda.
The episodes are actually shot around two months before their air. :D And the Yusuke thing wasn't really about Tenimyu, it was about not having Kuuga in the new Den-O movie, which iinm is supposed to take place some time between the two Den-O world episodes. They couldn't have Kuuga there when they hardly have space for Decade in it. 8D;;
Next is Den-O, Kabuto and Hibiki, yeah. I'm eager to see what happens to Decade when the world-hopping is done, the whole thing got really formulaic after a while. Sure seeing the old riders again is awesome, but the little story it had going on at the beginning isn't really going anywhere so far.
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The episodes are actually shot around two months before their air. :D And the Yusuke thing wasn't really about Tenimyu, it was about not having Kuuga in the new Den-O movie, which iinm is supposed to take place some time between the two Den-O world episodes. They couldn't have Kuuga there when they hardly have space for Decade in it. 8D;;
Next is Den-O, Kabuto and Hibiki, yeah. I'm eager to see what happens to Decade when the world-hopping is done, the whole thing got really formulaic after a while. Sure seeing the old riders again is awesome, but the little story it had going on at the beginning isn't really going anywhere so far.