Annnd here we go, final spoilers ahead, major spoilers for the final episode ahead:
[hide]48 - Conclusions: Fire-1 VS Joukaen
The Rescue Fire members get a break when Q-Suke finds a way to get them back into the hijacked Fire Phoenix base. Tatsuya learns that in the past, Joukaen hoped for coexistence with mankind. Is the conclusion to Fire-1 and Joukaen's story truly a battle?
49 - Crisis! Don Kaen's Complete Revival
Don Kaen makes Mt. Fuji erupt and uses its strength to bolster Ukaen, Sakaen, and Chukaen's. Even though it's certain the dragons will be destroyed, Yuuma feels resolute in proposing to Tama, though he tells her to give him her answer when he returns.
50 - Bring Forth the Impossible Miracle!
Don Kaen's full power is unleashed as he becomes a huge sun-like fireball and begins to burn the earth. Fires occur all over the earth and Tatsuya is left to battle them alone. Will the earth die? What is the fate of the other Rescue Fire members?
Final Episode / 51 - The Great Final Battle with Don Kaen, Explosively Completed!
Once more, Rescue Fire heads to space, learning the connection between Don Kaen and all of life itself. All the questions are finally answered in the final great battle between life and life.* And what of Yuuma and Tama-chan's marriage? Rescue Fire's fight isn't over yet!
I put life and life because Don Kaen is literally referred to as "the life", the very first being in existence.[/hide]