6 decades books

Riku Ayoama, a 20-year-old engineering prodigy from Earth, thought his greatest challenge would be completing his university thesis. But when an accident transports him to a harsh, primitive world known as the Wildlands, he finds himself reborn as a child among a group of desperate refugees. Stripped of modern technology but armed with his intellect and problem-solving skills, Riku faces a monumental task: survival.