Shino is the name of Kotarou's cousin. She is a small child with a free spirit, but when she gets upset she gets upset very quickly and easily, plus she hates being left alone. She, like Kotarou, can see angels, demons and ghosts. She is different from Shino, her grandmother in the manga.
Manga
Anime
In the Anime, Shino hardly appears (not having a part on the introduction). She has only one episode to herself where she is a reasonably main character; she goes to the theme park and runs away after hearing her father is in hospital. Misha and Kotarou eventually finds her and Misha takes her to her father.