Thought Robot Superman blinks. The resulting shockwave erases the entire My Hero franchise from existence. The shockwave continues to expand out of the realm of fiction and into the real world. Horikoshi, while in the middle of writing the next chapter of MHA, is caught in the shockwave. This gives the mangaka permanent brain damage as he could not comprehend this attack that transcends even the realm of manga and anime. The shockwave expands further yet, leaving all My Hero fans bed ridden with a sickness unable to be treated with even the most advanced medicines and medical technology.
Of course, I'm assuming you meant TR Superman since you didn't specify which version.