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Because of Susanowo no Mikoto's rowdy behavior, his sister Amaterasu Oomikami (Goddess of the Sun) hid herself in Amano Iwato.
Then it blacked out whole world.
Under the uncomfortable situation, multitudinous gods gathered in front of the Amano Iwato and banqueted for three days.
Amaterasu wanted to see what they do and opened the Iwato a bit.
Since Amaterasu was pulled out, the sun came back.