Oniken is an action platformer, highly inspired by 8-bit games of the late 1980's and early 1990's. This influence is visible not only on Oniken's graphics and sound design, but also on its story and even on game's difficulty. Oniken takes place on a post-apocalyptic future when a global war nearly destroys human kind. The few survivors are oppressed by a large military organization called Oniken. Player takes the role of Zaku, a ninja mercenary that takes part on the resistance movement.