Nayuta met Denji in the park when he was having a serious talk with Kishibe and he waved her off but she suddenly bit down on his finger vaguely similair to that one person he had to leave behind after he killed her but she still holds the Control Devil powers especially the great sense of smell for Devils and Humans.

Nayuta now is in Denji's custody and she slowly picks on Denji's behaviour like a little sister would funnily enough thry have a paper on the wall with a fart counter and Denji is winning ofcourse. At the toilet there is a paper saying "Don't forget to flush". Nayuta cares deeply about him and she likes cheap food just like Denji does... mostly bread or ice cream she is very possesive over Denji. She doesn't like it when Denji hangs around women especially Asa with her predicament with Yoru as her devil because she want him to be safe from women always chasing after his Chainsaw devil powers and trying to kill him in his past.