Boss Mumu's First Book

Thousands of years ago, Poseidonia sank, Atlantis gave out its last cry, and the ancient marine civilization fell. The old world was completely destroyed, and the new world rose from the sea. Its forgotten descendants want to trace the relics of the old country, but they don't know that quietly, the divine punishments from the twenty-four gates are appearing, and a group of people walking outside the "world" are changing their trajectories...