 Like Takenaga, he comes from a wealthy family (who own a series of hotel chains), but was sent to live with the Landlady because he exploited his wealth and his parents wanted him to become normal.Surprisingly, Ranmaru is actually better at kendo than Takenaga, who comes from a traditional family.He apparently is the strongest advocate of making Sunako into a lady and is usually responsible for doing her make-up whenever she has to dress up; however, his attempts are rarely successful in the long run and he is convinced that it is Kyohei's attitude towards Sunako that is the primary problem.