Naoko Naruse is a main character distinguished by her light brown hair and blue eyes, born October 5th with blood type B. Her name Naoko (直子) signifies "straight, direct child," while Naruse (成瀬) means "become swift current." She exhibits a tomboyish personality. As Himeno Toyokawa's childhood friend, Naoko joins the Pottery Club alongside Himeno and Mika Kukuri. She possesses incredibly detailed knowledge on various subjects the characters need information on. During Himeno's struggle to create meaningful pottery in the second season, Naoko suggests making personalized mugs for people around them, an idea that becomes a significant project for Himeno.