IV is a high school sophomore who serves as the manager and DJ for the unit Full Throttle4. He is the one who formed and leads the group, though he acts as a behind-the-scenes leader, always stepping back to let the other four members take the spotlight. As a result, he rarely appears in public except when acting as a DJ during live performances.

His personality is serious and considerate of his fellow members. While he is usually gentle, it is implied that he has a frightening side when angered. His role in the story of Kono Sekai no Tanoshimikata is as a supporting character within the wider Confession Executive Committee universe. Key relationships, personal motivations, specific character development, and notable abilities are not detailed in the available information.