Boukyaku no Rakuen

is a Japanese light novel series written by Taki Tsuchiya, with illustrations by Kinokohime. The series began publication on March 10, 2021 by ASCII Media Works under their Dengeki Bunko publishing imprint.

The series won the Silver Prize in the 27th Dengeki Novel Prize.

Synopsis
A world where the ocean covers most of the earth's surface after repeated conflicts. Lean is a paradise of oblivion where weapons, science, faith, and all the fires of conflict are managed and concealed in order to control humankind toward destruction. However, the highly toxic pollutant  created by the conflict still eroded people.

One day, the boy Arum was ordered to manage the mysterious girl Fluorite who has  in his body.

The secret of  that is revealed by the two people who can communicate with each other. It was a literal "poison" that rocked false peace.

What do boys get over the multiple plots over the new world of oblivion?