my deamon manga

Well, perhaps it's a graphic novel that focuses on a deamon lord who becomes a hero through time travel. Maybe he has to go back in time to correct some great wrong that was done in the past, which led to his current state as a deamon lord. Or he could be traveling to the future to prevent a catastrophe that would make his world even worse.

Maybe there is a wizard or a sage who helps the deamon lord hero on his time - travel journey. Another possible main character could be an antagonist from the deamon lord's original time who is trying to stop him from changing the past or future. And of course, the deamon lord hero himself, who is probably a complex character with a troubled past and a hope for a better future through his time - travel experiences.

We can conclude that there is no relevant answer to the question of " I'm invincible at the beginning of the manga."

Yes, it is. The series has reached its conclusion.

Yes, it could be. It depends on whether it's been adapted from a manga or not. You might need to check the credits or related information to be sure.

Yes, it is. The final chapters have been released and the story has come to an end.

Yes, it is. The story has reached its conclusion.

Yes, it is. The manga has reached its conclusion.

Yes, it is. The My Hero manga has reached its conclusion.

Yes, it is. The series has reached its conclusion.