Okita Mitsuba (沖田 ミツバ) is the older sister of Okita Sougo (沖田総悟). They lost both their parents while very young, and the sister single-handedly brought little Sougo up. As a result, Sougo was very attached and respectful, almost reverential to his older sister, addressing her in very respectful terms as a-ne-ue and o-ne-san. In her presence, his language became very proper and polite, using the more formal boku to refer to himself instead of his usual ore slang.