Diabolo

In a desperate bid to save his cousin, Ren makes a Faustian pact with the malevolent entity known as Diabolo, trading his soul for extraordinary powers. Ren is granted the ability to unleash devastating attacks, while his friend Rai gains the power to deflect any assault with ease. However, this dark compact comes with a terrible price: as the years pass, those who succumb to Diabolo's influence begin to lose their grip on reality at the age of 17, and by 18, they are forever beyond redemption.