While there is a happy ending of sorts for the surviving characters, as the world is saved and a period of peace comes in the wake of the global conflict, creator Hajime Isayama’s cynical view of human nature wins out in the final moments of “Attack on Titan.” This comes as the cities of Paradis are wiped out by future warfare.
Still, with Jean seemingly marrying Mikasa and the remaining characters, including Armin, serving as peace ambassadors, there is at least the hope that the allies were able to live peacefully before the world of “Attack on Titan” moved on to a more dangerous and extreme form of warfare.
As for Armin himself, most fans would likely agree that he would desire to be buried on that same hill, under the tree, with his longtime friends. On that note, even if all of the main characters are assumed dead during the future epilogue, the tree on the hill at least survives. This means that despite his tragic fate, Armin’s grave and his well-earned rest are at least undisturbed by the inevitable re-emergence of warfare on Paradis.