Not Traveling Through Time? It's Impossible Not to Travel Through Time!

After a long period of time, people on earth in the 30th century miss the extremely beautiful 21st century. In the name of time travel, I want to transform the twenty-one earth civilizations into high-energy civilizations. The protagonist said this after rebirth. From then on, the fate of the earth has been manipulated by a certain mastermind behind the scenes, hiding the big BOOS. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.