Nonoka Sugiura, nicknamed Nono, is a major character. She has shoulder-length red hair and red eyes and is a second-year student at Hanamiya Girls' High School. An original member of the school's climbing club alongside Sayo Yotsuba, they formed the core before Jun Uehara and Konomi Kasahara joined.

Her exceptional flexibility is her primary climbing strength, allowing her to secure challenging holds and navigate complex routes effectively. Yet, her short stature hinders her ability to complete routes requiring extensive reach. This height disadvantage contributes to competition underperformance and fuels a Napoleon complex, where she perceives her physical limitations as undermining her capabilities. These struggles lead to feelings of being the team's weakest link and trigger depressive episodes.

Throughout the series, Nonoka undergoes substantial development. Despite setbacks and emotional challenges, she demonstrates perseverance. Her commitment intensifies following an injury to Sayo Yotsuba, compelling her to shoulder greater responsibility for the team's success. She ultimately overcomes her limitations, playing a pivotal role in the team's critical performance near the series' conclusion. Her relationship with Sayo extends beyond club duties as a close friendship providing mutual support during challenging periods.

The etymology of her name reflects nature: "Nonoka" combines "field" or "wilderness" (野) with "flower" (華), while "Sugiura" incorporates "cedar" (杉) and "inlet" or "bay" (浦).