Monster Rebellion: A Federation's Traitor became the Monster Lord

In a realm of floating islands, where humans and monsters clash for dominance, Allen, a captain from Exploration Corps, seeks to avenge his parents' death at the hands of monstrous creatures. Driven by a desire for justice, he hatches a daring plan to use monsters as weapons against their own kind. As Allen ventures into the perilous world of monster training, he discovers the untapped potential of these powerful beings. With humanity's survival at stake, Allen must navigate the thin line between using monsters for the greater good, but this path denounced him as a traitor of the Federation, which led him exiled to the lands full of monsters.