Sousei No Taiga

Numb and disconnected from reality after a painful breakup, Taiga joins his university anthropology classmates on a routine field trip. But when they discover a mysterious ancient cave painting, a sudden collapse traps them deep underground. Escaping through a secondary exit, the students emerge not into the modern world, but into a brutal prehistoric wilderness dominated by mammoths and prehistoric predators. Stranded in the Pleistocene epoch, a detached young man must find his survival instinct in a primitive land where humanity is no longer at the top of the food chain.