Tamper with the grand design of nature, and nature will inevitably tear you apart. Join a freshly promoted Captain Tashigi in this timeskip era story as she ventures to the island known as Leviathan's Rest! Uncover the truth of what happened to her lost sister-in-arms, Azalea Noble! Unveil the dark horrors of a rogue scientist, Dr. Edison Cross! And learn what it means to be a TRUE Marine!