Arafou ni Natta Saikyou no Eiyuutachi, Futatabi Senjou de Musou Suru!!

Seven heroes ended a hundred-year war by defeating the demon lord and scattering his forces, securing peace for a quarter of a century. After parting ways, former hero Alan Granger now serves as a commander in the Royal Knights. He is disturbed by news that the demon army has reemerged. Recognizing the threat, he resolves to reunite with his former allies to confront the demons again. Now in their forties, the former heroes face a renewed enemy that has grown stronger. The question remains whether they can return to battle and protect the world from the returning demonic forces.