Makoto's wife. Also 25 years old, Makoto is the first man she has ever had sex with. She is loving, but extremely naïve on sexual matters and too shy to try something new by herself. Beautiful and charming, she is also the target of attention by many men (although their behavior is - compared to the women who adore her husband - mostly passive longing). She also has the knack of befriending most of the women whom she should consider her rivals for Makoto's affections; Makoto's colleague Makie Sugiyama is a notable exception. Yura is a big fan of undead-themed horror movies. When she was in high school she was a member of the Tennis club. (Source: Wikipedia)
Promiscuous Yura's sister. 20 years old. Is very experienced in relations with men, by far, had 30 sex partners. Now has 4 boyfriends. Is somehow worried about the married life of her elder sister and gives her advice about making love.
A male bear. Kumakichi is Usami-chan's classmate, who will more often than not be the culprit in the cases Usami-chan solves. (Source: Wikipedia)
Sakura spent most of her life training in the United States. She uses Shinto magic and magic seals to stop the Aragami. She often flirts with Kusanagi just to get under the skin of Momiji, but also helps Momiji deal with the Aragami. Source: Wikipedia
Boy genius and heir to the Kimura Industries conglomerate, developers of the new G-Reaction power system. Extremely intelligent with an aggressively "take action" attitude. He has a crush on Lotta, a rivalry with Penny and doesn't like dogs much. (Source: Wikipedia)
Daughter of Dr. Brest, a leading scientist. She has been a close friend of Billy since they were quite young. Not that they're all that old now... She often tags along with Billy, occasionally even resorting to stowing away to achieve this end. You'd think Emely would be able to stop such behavior... She's terribly fond of her "little sister" Myusha. (Source: Wikipedia)