Saga of Monkey

Saga of Monkey is a Japanese manga series written and illustrated by Shinjiro Futaba. It is published by Zoom! as part of their shonen manga line Zoom! Shonen Works and has been since 2012. The series follows a monkey-like teenager known as Saru who befriends a young girl known as Sirop as they make it their goal to face the Warlords of the Wasteland while Saru grows stronger.

Plot
Set in the year 2132, the corporation known as the Echo Corporation has caused an apocalypse due to their pollution and obsession with tech, causing the world to become an arid and toxic wasteland. Echo's experimentation caused there to be several humans with either cybernetic or animal-like attributes as they rule over the abandoned wasteland world. The series follows Saru, a goofy and fight loving teenager with monkey-like characteristics as he makes it his goal to take down all the Warlords of the apocalypse, befriending an optimistic little girl known as Sirop, as she helps him with his goal to face the Warlords and more threats.