man Izanami sure is popular, is it the myth behind her and Izanagi that's doing it or what?

Izanami is Izanagi's wife.They creat many god and the first land.
When Izanami died in childbirth, Izanagi tried (but failed) to retrieve her from Yomi (the underworld). In the cleansing rite after his return, he begot Amaterasu (the sun goddess) from his left eye, Tsukuyomi (the moon god) from his right eye, and Susanoo (tempest or storm god) from his nose. The story of Izanagi and Izanami has close parallels to the Greek myth of Orpheus and Eurydice, but it also has a major difference. When Izanagi looks prematurely at his wife, he beholds her monstrous and hellish state and she is shamed and enraged. She pursues him in order to kill him. She fails to do so, but promises to kill a thousand of his people every day. Izanagi retorts that a thousand and five hundred will be born every day.
After that,Izanami become the goddess of death.