Supernatural, Action, Seinen, Adventure, Drama, Mystery, Sci-Fi, Mecha

In the middle of a near future apocalypse, nature is taking Earth back from humanity: foliage and trees wrap around buildings, reclaiming cities into acres of forest, and powerful wooden mecha called the Arethusa rampage their streets. Teenager Souma Shin visits New York to see his twin brother, a genius scientist studying aeropathy - an ability to communicate with the forest’s network - in the hopes of stopping the foresting spread. During a military facility visit, Shin attempts to save a group of children held there when an Arethusa attacks. Amidst the chaos, his brother injects Shin with a serum to save him from death, changing him into a hybrid of human and Arethusa. But it comes with a cost: he will slowly be consumed by his new half, becoming another one of nature’s soldiers. Will Shin manage to keep this side of him at bay long enough to find answers? Or will he perish at the military's hands?