Kageaki Hiyama is a main character in the live-action series A Pocketful of Adventures. A male employee at the company ADventure, Hiyama is 1.8 meters tall and weighs 82.3 kilograms.

Hiyama had a studious background, originally aspiring to become a designer and dedicating years to studying for that career. His first job, however, placed him in the sales sector, a role that left him completely demotivated. During that time, he was friends with two other designers, Syo Sawamura and Kenji Ebiwara, but he eventually drifted apart from them. Later, Hiyama left that company and joined ADventure, once again working in sales. His personality was shaped by this history, as he was discouraged by his position selling the company's services rather than engaging in the creative design work he had originally pursued. However, his passion for creativity is eventually rekindled.

Within the story, Hiyama becomes a reliable partner to the protagonist Madoka Akagi. When Madoka decides to enter the Tokyo Short Film Contest, Hiyama works with her on the project. Initially, during a meeting, Hiyama does not contribute much because of his background in sales, which leads Madoka to try to change his mood by engaging him in Pokémon battles. His role involves overcoming personal and creative blocks to push forward toward his dreams, converting the bumps and detours in his path into valuable experience. A key relationship is his partnership with Madoka, who actively helps him re-engage with his creative side. The character undergoes notable development as he rekindles his lost passion for creativity, transforming from a demotivated sales employee into someone who actively participates in a creative project as a dependable partner. Regarding notable abilities, the search results primarily focus on his professional and personal journey rather than any specific extraordinary skills.