The Lion of Babylonia

Shin and Leona are childhood friends who are dating each other in high school. On a school field trip in France, they encounter a misadventure through a distortion in timespace bringing them back in time to the ancient city of Babylonia. Leona becomes the goddess Ishtar, and Shin becomes the beastmaster, Enkidu. In a story loosely based off "The Epic Tale of Gilgamesh", Shin (Enkidu) seeks to bring Leona (Ishtar) back to the normal world and in the process helps Gilgamesh in his quest towards immortality.