Mei Irizaki holds the position of Chief Torpedo Officer on the destroyer Harekaze, tasked with operating and firing its torpedo systems. Her core duty involves aiming and launching torpedoes in naval combat, an activity she approaches with infectious enthusiasm. Born January 28th in Kawasaki Bay, Kanagawa Prefecture, Mei stands 146 cm tall with blood type AB. Her favorite academic subject is Japanese history, while physical education ranks as her least favorite—a direct contrast to her close friend Shima Tateishi's gym prowess. Off-duty, Mei enjoys shogi and carpentry, often studying shogi game records. She prefers eel rice bowls and dislikes zaru soba. Visually, Mei possesses brown eyes and brown hair typically styled in a broad ponytail fastened by a red ribbon. A green hair clip secures a lock of hair on her left side. She is rarely seen without her signature orange cat-themed hoodie, worn persistently over her school uniform, even while sleeping. Aboard the Harekaze, Mei exhibits a cheerful, genki personality, contributing significantly to the bridge's lively atmosphere. She finds exhilaration in naval combat, describing the firing of torpedoes or depth charges as "music to her ears." Conversely, she displays a distinct aversion to being targeted by enemy fire, showing visible fear during unexpected explosions or shelling. Occasional impatience surfaces in irrational outbursts, like yelling at crewmates unprovoked. She frequently quotes phrases from "The Three Major Daimyo," particularly favoring the decisive line "If the cuckoo doesn't sing, kill it." Mei demonstrates character development: initially trigger-happy and eager for combat, she learns restraint. During the Admiral Graf Spee incident, she refrains from firing torpedoes despite opportunities, prioritizing broader tactics over personal enthusiasm. She also reveals unexpected comedic skill during a cultural festival performance. Her closest bond is with Shima Tateishi, the ship's artillery officer. Their strong friendship develops through shared adventures, with Mei supporting Shima during confinement caused by the RaTt virus. Despite this closeness, their academic strengths contrast—Mei struggles in physical education while Shima excels. Mei interacts generally friendly with other crew, though her impatience can occasionally strain relations. Her surname, Irizaki, originates from Cape Irizaki on Yonaguni Island. The name Mei combines the characters for "bud, sprout" and "clothing, garment."