OVA
Description
Mako Reizei, a second-year student at Ooarai Girls Academy, serves as the driver for the Anglerfish Team's Panzer IV tank. Diagnosed with hypotension, her condition causes excessive sleepiness and significant difficulty waking early, resulting in a notable school attendance record: 251 late arrivals, 12 absences, and 5 authorized absences. Despite her constant tiredness and academic disengagement, she possesses exceptional intellectual ability, achieving top academic performance in her class. Her aptitude extends to mechanical comprehension, enabling her to master complex tasks rapidly; she proficiently operated a Type 89 tank after merely glancing at its manual for seconds.

Her personality blends apparent apathy with moments of expressiveness. She harbors specific fears: acrophobia (fear of heights), phasmophobia (fear of ghosts), and a pronounced apprehension toward her grandmother Hisako Reizei's nagging. Mako deeply cares for her grandmother, her sole surviving close relative following her parents' death in an accident during her elementary school years. Her initial motivation for joining Sensha-dō (tankery) was pragmatic: accumulating merit points to offset her tardiness records and avoid repeating the school year. This practical concern evolved into deeper loyalty after Miho Nishizumi assisted her in reaching school one morning.

Her familial bond significantly drives her actions, highlighted when news of her grandmother's hospitalization reached her during a match. In desperation, she attempted to swim ashore to reach her, only to be stopped by teammates; Kuromorimine Girls' Academy subsequently provided transportation. Witnessing her grandmother's recovery reinforced her resolve. As a tank driver, her skills prove crucial. She demonstrates remarkable reflexes and tactical driving, notably during the finals against Kuromorimine, where she evaded sustained fire from Maho Nishizumi's Tiger I before executing a precise drift maneuver to position the Panzer IV for the winning shot. Following Ooarai's tournament victory, her attendance record was cleared by Midoriko Sono (whom she nicknames "Sodoko"), leading to an emotional display of gratitude where she hugged Midoriko. Seeing her grandmother dancing during the victory parade provided visible joy and closure regarding her health.

Supplementary media provides further context: her fear of heights is explicitly shown during a school ship tour in an OVA. She briefly visited Pravda Girls High School in a CD Drama and received a piggyback ride from Nonna, making her one of only two characters to do so besides Katyusha. Manga depictions portray her with even lower energy levels compared to the anime. Running gags include portraying her as cat-like and instances of envy towards Saori Takebe's physical appearance. Her name carries a phonetic resemblance to the English word "Lazy" in Japanese pronunciation, reflecting her sleep-focused demeanor. Additional personal details include a September 1st birthday, a favorite tank (the German Panther Ausf.G), and a favorite flower (Olive). She initially selected Calligraphy as an elective before joining Sensha-dō.