Kamitsumaki

The division into three scrolls is not a printer's convenience. The first ends precisely where the imperial line begins, and that boundary is the argument the book was commissioned to make. Everything in the upper scroll happens among kami: the deities who come into being at the parting of heaven and earth, the pair who churn the brine and make the islands, the sun goddess born from a washed eye, the storm brother expelled from heaven, the ruler of Izumo who yields his country. The moment a sovereign takes the throne in the plain of Yamato, the scroll is over.

Read that way, the upper scroll is a title deed. It establishes that Amaterasu is the ancestor, that the regalia she gives her grandson come from her hand, and that the earthly powers who held the land before agreed to hand it over rather than being merely conquered. Nothing in it is incidental to descent. Even the long strings of names that a modern reader skips are doing the work, because a genealogy is the form the claim has to take.

That also explains an absence. There is no creation from nothing, no legislating deity, no moral code delivered from the sky. The scroll does not tell anyone how to live. It tells them where the ruling house came from, and it is the later reading of the Kojiki as a religious book, rather than the compilation itself, that turned this material into something resembling scripture.

Two episodes dominate the upper scroll and they pull in opposite directions. The first is the rock cave. Susanoo's violence in the heavenly fields drives Amaterasu to shut herself into a cavern, and the world goes dark. The assembled deities respond not with force but with a staged performance: a mirror hung on a tree, a rope, a dance on an overturned tub, and laughter loud enough that the sun goddess opens the door to see what could be funny without her. She is drawn out, not fetched. The pattern of the episode, an offended deity coaxed back by ritual and mirth, is repeated in shrine practice for centuries afterwards.

The second is Izumo, and it is the puzzle. A chronicle written to justify the Yamato court gives an extraordinary share of its space to a rival centre on the Japan Sea coast, to Susanoo's exile there, to Okuninushi's trials and his building of the country, and finally to the negotiation in which he surrenders it in exchange for a great shrine. A conquest could have been asserted in a line. Instead the text concedes that Izumo built the land it is handing over, and pays for the transfer with a sanctuary.

Historians read the emphasis in different ways, as the incorporation of a genuinely powerful cult that could not be written out, or as a literary device that makes the handover look consensual. What is not in doubt is that the compilers thought Izumo had to be answered rather than ignored.