While at his friend's home, Bon Namihira accidentally witnesses time travel in action and finds out that to keep it a secret, he must be erased.

After narrowly escaping erasure, Bon must learn the ropes of being a Time Patrol agent. His first mission: 1947 Tokyo in the midst of Typhoon Kathleen.

In 3319 B.C. Sumer, a young boy develops the beginnings of an ancient writing system — but his village is under threat from raiders and needs protection.