忘却の楽園 (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: After repeated conflicts, most of the earth's surface is covered by oceans. In order to control the human race, which is on the verge of extinction, weapons, science, faith, and all other sources of conflict are controlled and kept secret in the paradise of oblivion called "Lean. However, the poisonous pollutant "Arsenone" created by the conflict still continues to eat away at the people. 　One day, a young boy named Arum is assigned t...