Savior

After explaining the Makai Knights' conduct with human lives when it appears he is planning to kill Iyu, Rei proceeds to fight Ring, who reveals that he left his feather behind on purpose so they can settle this in a battle of both blades and ideals. Even after Ring attempts to have the humans kill him, Rei refuses to stray from his ideals. Yuna and Kain arrive soon after, dealing with the Horrors before they find Iyu. Ultimately, Yuna lacks the will to kill her mother as Iyu uses sings to soothe her. This pacifies the angry mob as Ring finds Iyu singing for her daughter instead of for himself.

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S05E01 - Fossil