(from ebookjapan):
Atarashii Furuhito is an aspiring archaeologist. He is conducting field research for his graduation thesis entitled "Proof of Himiko's Existence." There, Furuhito unearths a mysterious object, but a woman appears from inside. She is Tora Bell. She is a female thief who travels through time and space with a time machine. She forces him to offer her room at his lodgings as a temporary hiding place for the various treasures she intends to steal and collect from all the "times" in the world. She also asks him to be her assistant. ......?