Chiteikoku no Kaijin

A sapient rabbit named Mimio is born in an university lab experiment. However, Mimio thinks he is human. So he escapes and finds refuge under John, an orphan kid scientist who is constructing a train capable of penetrating the earth's core, thus allowing for safe transportation. Initially, the train runs fine but it stops at the Earth's core. When they get out, they are swept away by groundwater... What lurks below the surface? Will Mimio and John survive? Note: Won Best U.S. Edition of International Material at the Eisner Awards in 2014.