For 10 points, name this myth system whose worshippers revere spirits called kami, the traditional religion of Japan.
In this myth system, a sword named Kusanagi is used by a deity who is born when another deity washes himself upon returning from the underworld. Another deity born from that event was created from Izanagi's left eye, and has a brother named Tsukuyomi; that deity is the sun goddess Amaterasu. For 10 points, name this myth system whose worshippers revere spirits called kami, the traditional religion of Japan.
In this myth system, a sword named Kusanagi is used by a deity who is born when another deity washes himself upon returning from the underworld.
{Shinto} [prompt on {kami} worship or similar answers]