Maika Tsuchimikado

As the younger stepsister of Motoharu, this dedicated student attends a specialized maid academy, often seen traveling atop a cleaning robot while dressed in her signature uniform. Although she resides in her school's dormitory, she frequently visits her brother's apartment to stay. While she shares a friendly bond with Touma, she maintains a strict secret regarding the mysterious girl living in his home, sharing this private knowledge only with him.