The Super Big Bro of the Skies
"I guess today's the day I'm getting a raise!"
Mayu "Mashiro" Shirokawa is the main protagonist of The Quarter Game. She's a kuudere that does not show much emotion, but she started opening up her feelings more after forming a close bond with Isuzu, Chizuru, and Hazuki. This friendship started with her fierce desire to learn how to counter Isuzu's magic spells. Despite rigorous swordplay training from her samurai father, she could never beat Isuzu. Years later, due to her priorities in life of becoming the richest person in the city, she closed off some of her connections to focus more on her job. She works for her mother's company, Shirokawa Incorporated.
In The Quarter Game, her mother has been kidnapped by a ring leader in the black market, who wishes to obtain Shirokawa Incorporated's new technology. Because her father, a samurai, has gone missing after a dangerous military mission, she decides to take this on her own hands. Though having a selfish desire of doing this to possibly get a raise, she cares more about her mother than money. Mashiro succeeds in saving her mother, while finding out that her father returned to save her mother as well. Unfortunately, her mother is severely injured. Rather than getting a raise, her mother handed Mashiro the title of CEO of the company.