Рокумацурі Мінадзукі

Chitose's adopted younger sister. Mina currently attends the middle school section of the same campus as Chitose. She lives with her sister Hazuki (whenever she is not touring) in an apartment building not far from Chitose's house. Mina loves Chitose like a real brother and helps Chitose whenever she can. She plans to marry Chitose when she is old enough.