Time Bokan is a Anime, Episodic PC game, developed by Yomiuri Telecasting Corporation (YTV), available on Steam and published by Crunchyroll.
The history in our textbooks are all wrong?! In the 24th century, humankind accomplished the invention of a time machine, “Time Bokan”. As they discover the truth about history, they realize that the history written in their textbooks are all wrong!