Furry: Still a Beastman in This Life

In a chaotic world, a boy who was once human becomes a beastman on his fifteenth birthday after enduring excruciating pain. A pair of eyes that can see through all things catches the attention of certain people, and his mysterious older brother returns home. One strange event after another unfolds around the boy. Then a beastman claiming to be from another world appears, with his sights clearly set on the boy. He calls the boy his property and addresses the boy's older brother as his younger brother.

Who is the boy really? His older brother sets out on a journey with him.

The older brother seems to be carrying out some kind of plan. He realizes that everything has changed and that the plan appears to have failed. What will he do next?

What will happen when a boy and two seemingly invincible people cross paths...?