The following novels all had system elements: 1. "Check in in the Ultraman world." 2. I Might Be a Fake Ultraman 3. "Ultraman: Magic Cards" 4. The Legend of Ultraman Game 5. "I'm in Otto, and the instructor is Taylor!" 6. "Ultraman: I'm stuck with a system bug. I'm invincible." 7. Ultraman Anykey 8. Ultraman: Infinite Plug-in 9. Ultraman in the Ke world 10. [I'm a serious System] I hope you like this fairy's recommendation. Muah ~π