|Height||140 cm (4' 7")|
|Weight||36 kg (79 lbs)|
|Anime debut||Her Whereabouts|
|Japanese voice actor||Miki Fukui (visual novel)|
|English voice actor||Corey Hartzog|
Yu (勇, Yū) is a young boy who first appeared in Yukine's arc.
After calming down, Yu explains to Yukine that his 21-year-old sister ran away after a fight with their mom. Yukine tells him that she would help him find his sister and speak to the gang. Yu is quite thankful for this. After reuniting with his sister, Yu is seen later with Youhei Sunohara who is teaching him how to be a man. Yu appears in Valiant Fight wanting to meet Yukine's older brother, Kazuto Miyazawa.
Yu makes a cameo appearance in episode 16 of ~After Story~ in the photo on the Christmas card sent to the Okazaki residence.