Early on, Natsu develops feelings for Arashi, despite being fully aware that Arashi already has a girlfriend. She was originally jealous of Hana, Arashi's girlfriend, but has made peace with their relationship and is implied to have gotten over her crush on him by the end of the series.
Natsu's family consisted of her father, mother and younger brother. Her strict grandmother lived in a fishing village, in which she hated the smell of sea. Natsu always hated going to her grandmother because the old woman was very strict and would always criticize her.
She also had a pet cat named Nuts, who she cherished more than anything in the past world.
She is fond of cats, and other pet animals. Once she found a young carnivorous rabbit and wanted to keep it. Arashi gave it the name Peanuts. But the baby got killed by Mozu who said it would draw in the rest of the pack.