Yuki Izumi is a firefighter at Sakuragaoka Fire Station, working alongside the male protagonist Soma Mizuno; they joined the force around the same time. He possesses an infectious cheerfulness and a natural aptitude for boosting workplace morale, fostering team spirit during both emergency calls and social events like mixers.

Outside of work, he is often eager to find a girlfriend, a motivation that occasionally surfaces during firehouse social events. His interactions with colleagues, including Soma Mizuno and their senior Jun Hase, show his integration within the professional team.

Standing 187 cm tall, Yuki also diligently cares for his dog, Sayaka.