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Kaito Momota is probably not invincible. Ending the killing game would not make him invincible. Because at the end of his story, his own body would be the one to betray him.
Kaito Momota is almost certainly not invincible. Maybe the luminary of the stars wasn’t the indestructible Superman he showed his sidekicks. Training no longer made his illness-wracked body stronger. Neither did putting on an act.
Kaito Momota is not invincible. But illness isn’t what would break his resolve for life. It’s the ideal of truth and friendship. In the space station, communication is key to all. Defeating the mastermind of a killing game is the same way, right? He’d get it.
This could be dumb, but—
Kaito Momota doesn’t have to be invincible. Not physically, because his morals are unbreakable. Even if it costs him his life. He won’t crumble under a despair-filled, artificial reality.
Is his story over just like that?
Kaito Momota was not literally invincible. Invincibility doesn’t live in the body. It lives in what we choose to stand for. His values didn’t waver, no matter what he was going through.
Kaito Momota was a tragic hero. Not because he failed— he never did. The tragedy was in his success. Kaito Momota succeeded too well in a world that was never built to reward that.
But true heroism doesn’t lie in characters with physical invincibility which you only see in fiction. They lie in those who know invincibility is within giving themself for the greater good; because that is someone who keeps fighting, even in absence.