Tears to Tiara

Tears to Tiara is an anime series adapted from the PlayStation 3 remake of the same title developed and published by Aquaplus.

The story is set in a world based on British, Celtic & Roman mythology during the Dark Ages. The series follows the adventures of demon lord Arawn, who has been resurrected since his death 1,000 years ago by Drwc, a priest from the Divine Empire. Offering a girl named Riannon, a descendant of the Elf King Pwyll as a sacrifice, Drwc plots to use Arawn's powers for world domination.

Demon King Resurrection (Episode 1)
Riannon is put under Dwrc's mind control spell after she reveals her true name to him.

The People of the Vow (Episode 2)
Drwc uses Riannon as leverage to prevent Arthur from attacking, but they are not aware that Arawn has dived into her subconscious to release her from Drwc's spell.

The Song of Beginnings (Episode 21)
The white spirits start to mind control humanity.