Well, we can travel through time by playing a game or watching an anime. We are really convinced.
Why do some people speak English even though it is the Warring States Period? !
Why is there a Gundam cheat when there is someone from the Warring States Period? !
Why...
Forget it, we don't know much about the history of Japan's Warring States Period anyway, so we can live as long as we can. We are not normal people anyway.