Reincarnation of the Death Dancer

100 years ago, All planets fused to one, Terryfying monsters attacked mankind. at the same time, People awakened their powers and battled the monsters.

Mankind investigated the new world and found other intelligent beings and formed a peace contract, while some unfriendly intelligent beings refused.

Fast forward in the future.

Combat Sport was the most popular thing to do, School trained students to fight, Battle Arenas held everywhere in the world, Royalties hosted tournaments, and gifted people were everywhere.