Casshern Sins (2008)

S1E22 A Drop Called Eternity

Dio has shed his hunger for immortality. All that remains is a singular, burning purpose: to clash with Casshern, even if that final confrontation means his own end. Leda pleads with him to accept Luna’s gift of healing, but her words fall on deaf ears. The concept of living forever holds no sway over him anymore. He is a blade honed for one last strike, and the only future he can envision is the one where he and Casshern meet in a blaze of final conflict.