Yūka Sasahara has been Kaede Saitou's classmate since their middle school days and remains so in high school. She consistently expresses concern for Kaede's safety during mountain climbing activities. Within the second season specials, specifically the episode "Bra no Susume?", Yūka learns Kaede wears only sports bras and strongly urges her to purchase more feminine undergarments. Despite Kaede's lack of enthusiasm for flashy clothing, Yūka's persistent efforts organize a shopping excursion that includes Aoi Yukimura, Hinata Kuraue, and Kokona Aoba. This incident demonstrates Yūka's investment in Kaede's personal choices extends well beyond climbing-related safety.