Special effects: Saving the world starting from becoming a Zergling

Kamen Rider fanfiction with some Super Sentai and Ultraman elements: Yuuma accidentally travels to the Kamen Rider universe. After merging with his own memories, he discovers he's already dead and has become a Worm! And right below him are Worms and Xiaoxu! Tendou, who was supposed to be there, is nowhere to be seen. Desperate, Yuuma fights back, only to bump into Kabuto who just arrived… I'm a Worm, and I've encountered the invincible Tendou Souji?! Yuuma is instantly numb, but he still decides to struggle, survive in this Kamen Rider universe, and become a true Kamen Rider! Kamen Rider fanfiction must have the spirit of "Rider." This is the story of a villain with a body different from others, but who embodies the will of a "Rider," traveling through the Kamen Rider universe.