Kiriyama is a supporting character in the anime Murai in Love and a close friend of the protagonist, Murai. He is a second-year student in the plastic arts course at Takebe Gakuen, distinguishing him as a creative individual within the school's social landscape. His full name is Akifumi Kiriyama.

Personality-wise, Kiriyama is most notably characterized by his extremely loud voice, being humorously considered the loudest person in the world. Despite this boisterous and somewhat overwhelming exterior, he possesses a surprisingly sharp and perceptive nature. He has a strong capacity for observation, which allows him to see beyond surface-level interactions. He is a loyal friend, using his perceptive abilities not for personal gain but to aid those he cares about, even if his methods are often conducted from behind the scenes. He shares a close bond with Murai and their other eccentric friend, Hirai, with the three of them forming a small, tight-knit group of students who are considered unconventional by their peers. Kiriyama's family also plays a small role in the narrative, as it is revealed his parents run a liquor store, a location that becomes an incidental setting for a key scene involving Murai's teacher, Tanaka.

Kiriyama's primary role in the story is as a steadfast and active supporter of Murai's seemingly impossible romantic pursuit of their teacher, Tanaka Ayano. Unlike other students who might merely watch the unusual situation unfold, Kiriyama, alongside Hirai, consistently takes direct action to assist his friend. This support manifests in various practical ways. For example, when Murai decides to learn more about Tanaka's favorite video game character, Hitotose, Kiriyama joins him and Hirai in the difficult task of reading through the lengthy otome game Sengoku Koi Emaki. He also helps Murai fulfill a favor for classmates, working a booth at a Doujinshi convention, which further demonstrates his willingness to get involved in Murai's chaotic romantic schemes.

His motivation is rooted in a combination of loyalty to his best friend and a keen understanding of the situation. Kiriyama is not simply a tag-along; his high observation skills mean he often recognizes what Murai needs and acts on it, sometimes without being asked. He acts as a quiet but effective operator, orchestrating events from the background to give Murai a better chance with Tanaka. This is shown when he and Hirai explain to a worried Tanaka that Murai has been secretly training after school, leading her to run to him, or later when he and another teacher, Yamakado, work to help Murai and Tanaka when they find themselves in a compromising public situation.

Over the course of the series, Kiriyama remains a constant pillar of support for Murai. He does not undergo a radical personal transformation, but his role as a perceptive and reliable friend becomes increasingly evident. His development is subtle, reinforcing that his boisterous personality masks a deeply loyal and emotionally intelligent individual. While he is often involved in the comedic and chaotic misunderstandings that plague Murai and Tanaka's relationship, his actions consistently prove he is one of the few people who truly understands his friend's pure-hearted determination.

Kiriyama does not possess any supernatural or combat abilities, as the anime is a romantic comedy set in a realistic high school environment. However, his notable abilities are social and psychological. His highly perceptive nature allows him to read situations and people accurately, while his loud voice and bold personality enable him to take charge of situations when necessary. He is a skilled support player, using his observational skills to understand the emotional state of both his friend and Tanaka, and then acting on that information to guide events in Murai's favor.