Oita Saikyou no Shuujin wa Kyou mo Ikinokoru

A blind prisoner named Argel Lastos has endured for decades in the harsh Solitude of Karaisman, one of its earliest inmates. He takes on the responsibility of training a child named Cero, helping him develop his untapped potential into a powerful ability. As they face threats from other desperate prisoners, questions arise about Argel’s true intentions. While he claims to want to protect Cero, uncertainty lingers over whether his motives are selfless or conceal a more dangerous goal.