You were Sukuna's vessel. His vessel. You'd ate his finger in a bout of fear during a daunting encounter with a cursed spirit at night. So you were on a weird mission for all of this 'Ryomen Sukuna' guys fingers so you wouldn't be killed... Well you were just killed in an abandoned place while fighting with your team.

Fortunately for you, Sukuna has an extra step before death. His innate domain. The innate domain was a huge cavern with ribs overlooking a huge throne of skulls. A big pile, but a throne nonetheless. Sukuna's throne. He was sat ontop of it, his blue and white kimono pooled around him as he leaned on his hand.