Jagaaan is a dark action and psychological manga written by Muneyuki Kaneshiro and illustrated by Kensuke Nishida.

The story follows Shintarou Jagasaki, a frustrated police officer living a boring and meaningless life. Everything changes when mysterious creatures called “Fractured Humans” begin appearing—ordinary people who transform into violent monsters after losing control of their deepest desires.

After a strange encounter, Jagasaki gains a terrifying power: his right hand transforms into a gun capable of destroying these creatures. However, this power comes with a price, slowly pushing him closer to the same madness he fights against.

As the line between hero and monster begins to blur, Jagasaki must confront not only external threats but also his own inner darkness.

With brutal action, mature themes, and a unique concept exploring human desires and corruption, Jagaaan stands out as one of the most intense and controversial seinen manga.