Kaoru Sagano

Age: 29 Kaoru is Koutas older sister. The first time she meets Kako there is a big misunderstanding. She is a quicktempered violent sister who likes to and often does boss Kouta around. She likes Kako so she shares stories and photos about Koutas past enjoying reliving every moment of embarrassment Koutas had. She also cares greatly for Kouta and asks Kako to look after him.