Tsuchimikado Maika

Motoharu's younger step-sister. She wears a maid attire as she is a student at Ryoran Maid School and rides on top of a cleaning 'bot. She has a friendly relationship with Tōma and knows that he has two girls(Index and Aisa) living with him but keeps the secret between her and Tōma and is a good friend of Mikoto as she works at her dormitory. Even though she lives in her school's dormitory, she sometimes goes to live at her brother's apartment; for instance she once stays at said residence because her dormitory's air conditioner breaks down.