|Family and Relatives||Wataru (father/older half-brother)|
Hinako (ひなこ) is one of Rin's younger sisters.
Hinako is the daughter of Wataru and Kagura Inou. Though she is Wataru's daughter she is also Kagura's daughter so she might be one of twelve girls who admires Wataru as a older brother and left Kagura with him.
Summer Radish Vacation!! 2Edit
In one of the possible scenes of Rin's first appearance Tomaru use her name as he tried to guess Rin's name.