[Sentai Daishikkaku]

A story about a righteous hero and an evil monster, but the monster is the protagonist. Our protagonist is a low-ranking monster grunt, "D." Every weekend, a battle unfolds between the righteous hero "Dragon Keeper" and the monsters, but it turns out to be a staged fight?! Combatant D, aiming to truly defeat Dragon Keeper, infiltrates the Super Sentai and disguises himself as a team member. It's a story where the evil monsters are more human, and the supposed heroes, the Sentai, appear villainous. The OP and ED are also wonderful. Especially in the first season's ED, the monsters' dance moves were all over the place, while the Sentai's were systematically synchronized. This made the monsters' humanity even more apparent, and the ending scene made the Sentai look suspicious. While the plot had some rough patches, the world-building, setting, and BGM were solidly crafted, making it a recommended series.