Nanatsu no Taizai - Kamigami no Gekirin - Episode 10 - Demon King Looks Down

We were bound to meet the Demon King during that terrible war 3,000 years ago, but it was a shock to see who he was standing next to when we did.

The Demon King and the Supreme Deity worked together to curse Meliodas and Elizabeth for their sin of loving each other and trying to have the Demon and Goddess Clans live together in harmony.

Meliodas was cursed to be immortal and never age. Elizabeth was cursed to be reincarnated, always find Meliodas and fall in love, but to die within three days in front of him if she ever regained her memories of her past lives. This has happened to Meliodas and Elizabeth 106 times over the 3,000 years since the end of the war between clans.