孤高の人 (Series) favorite_border

[DeepL Translation - needs review] Introduction to Volume 1: On his first day at his new school, a lonely young man, Buntaro Mori, is encouraged by his classmate Miyamoto to climb the school building. One wrong step and he could have died, but the moment he made it, he felt a sense of fulfillment that made him realize that he was alive, something he had never felt before.... Buntaro's desire for climbing began to accelerate...!

(Translator: DeepL)