Gagarin's Famous Quote Was, "The Earth Is ______"!

Time Bokan 24 · Episode 9 · “Gagarin's Famous Quote Was, "The Earth Is ______"!”

The anime centres on Tokio, a junior high student living in the present time who is suddenly made a member of the 24th century's Space-Time Administration Bureau. Immediately, he learns that the history he has learned in the textbooks is wrong, and there is a more interesting version of history...