Koharu Hiiragi

Koharu claims to be Kaito's little sister, and is a first-year student at Tenshudo Academy. A certain incident ten years ago left her orphaned, and she's called Tenshudo academy her home ever since, living under its care and protection. Despite having no relation to him at all, she calls Kaito "Nii-san," and is absolutely, unequivocally supportive of him in anything he does. You might consider that the trust that comes with being regarded as her 'brother,' but she does love to tease him whenever he says something he shouldn't have. Having sibling-like moments with Kaito is her greatest joy....