"Tomoya Yamaguchi is one of the main characters in the Japanese manga series ""It Starts With A Mountain"". He is a young and ambitious mountain climber who dreams of reaching the summit of the world's tallest mountain, Mount Everest. Throughout the series, Tomoya is depicted as a hardworking and determined individual who is willing to do whatever it takes to achieve his goal.

Tomoya is first introduced in the manga as a member of a mountaineering club. He quickly rises through the ranks due to his exceptional climbing abilities and his unwavering dedication to the sport. Over time, Tomoya becomes a mentor to the other members of the club and helps inspire them to push themselves harder.

Despite his impressive skills as a climber, Tomoya is also shown to have a softer side. He is kind and caring towards his friends and often goes out of his way to help them. He is particularly close to one of his club members, a shy girl named Saki. Tomoya takes on the role of Saki's mentor and helps her overcome her fears and anxieties around climbing.

As the series progresses, Tomoya's goal of climbing Mount Everest becomes more and more urgent. He begins to focus all of his energy on training and preparing for the climb, even though it means sacrificing time with his friends and family. However, as he gets closer to achieving his dream, Tomoya starts to realize that there may be more to life than just climbing.

Throughout the series, Tomoya struggles with the idea of what it means to truly be successful. He starts to question whether his obsession with climbing is worth sacrificing other aspects of his life. In the end, he learns that success can come in many different forms and that there is more to life than just reaching the top of a mountain.

Overall, Tomoya Yamaguchi is a complex and well-rounded character in ""It Starts With A Mountain"". His dedication, perseverance, and compassion make him an inspiring figure in the world of mountain climbing and beyond."