Saya Kawagoe is a model and influencer who began her career as a second-generation member of NGT48 in 2018. She appeared in the selected lineup for six consecutive singles before graduating from the group in February 2024. On her 25th birthday, October 14, 2025, she released her first photobook, Nantoka Narunaru; KADOKAWA followed it in June 2026 with the 81-page digital collection Nantoka Narukamo, assembled from alternate cuts selected by Kawagoe.