Once an avid mountain enthusiast turned indoor hobbyist due to a fear of heights, shy high school freshman Aoi Yukimura leads a solitary life until she reunites with her exuberant childhood climbing companion, Hinata Kuraue. Encouraged by Hinata's infectious energy, Aoi rediscovers her love for climbing and embarks on a journey of friendship, self-discovery, and overcoming her fears as she delves back into the world she once cherished.