These are first two Japaneses gods, think of them like Father and Mother.
Izanami ("Exalted Female")
They had two children,but they were badly-formed and are not considered gods in their original form. They dismayed at their misfortune, put the children into a boat and set them out to sea.
Awashima ("pale island")
Long story short they tried again and gave birth to 8 great islands(not children this time, by the way take a look at the naruto world map you would notice something pretty intresting).
Then Izanami died while giving birth to another child Kagutsuchi
(incarnation of fire). Then the good father Izanagi is, he killed the child out of anger.
Izanagi then went to Yomi (The shadowy land of the dead) to find Izanami (apparently it's eternal darkness
there). When Izanagi went to save Izanami from Yomi he failed
, because he couldn't handle the shear sight of her anymore, as she was all rotted away and all ugly looking. Izanami said she had "already eaten the food of the underworld" (this is why she became ugly) and "now one with Yomi
" and finally she said "Izanagi your too late
". Izanagi got the hell out of there asap, running and screaming out of fear. Izanagi burst out of the entrance and quickly pushed a boulder in the mouth of the cavern that used to be the entrance to Yomi. Izanami screamed from behind this impenetrable barricade
and told Izanagi that if he left her she would kill 1,000 living people every day, Izanagi furiously replied he would give life to 1,500. And so began the existence of Death.
In the process of trying to find Izanami he now needs to purify himself because of his visit to Yomi, Izanagi purifies himself and gave birth to three more gods.
(incarnation of the sun) from his left eye,
(incarnation of the moon) from his right eye, and
(incarnation of storms and ruler of the sea and storms) from his nose.
: I found some interesting similarities from above with Sasuke, regarding which eye he use's for which Sharingan technique.
-Sasuke uses his left eye for Amaterasu.
-Sasuke uses his right eye for Tsukuyomi.
-Sasuke uses both eyes for Susanoo. (Obviously nothing to with the nose, but it does show just like Izanagi used neither his left or right eye to create Susanoo, Sasuke also needs to use both eyes and not either one alone to use Susanoo.)
Just for completeness, I don't think you can draw any conclusions from this.
-Sasuke uses his right eye for Kagutsuchi. (This is the technique Sasuke uses to manipulate Amaterasu)
Ok that's the end of the mythology lesson,if you want know more its all here.