Ultraman's Ultimate Resentment

The protagonist traveled to the super-ancient civilization 30 million years ago in the Tiga world, and happened to encounter a battle between light and darkness, in which countless monsters were killed and injured. The resentment generated assimilated the protagonist. From then on, the protagonist can control monsters at will and strengthen them... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.