At the start of her arc, Mai is already in a relationship with Kamiya Jun, after they were paired by the Coupling Center. Mai is a second-year student and writes romance novels for an established publishing company. The characters in her novels seem to be based on Jun and herself to a degree. She also draws inspiration for her novels from ero-manga and personal experiences.
Makoto's sister-in-law and Akira's 27-year-old wife. She is annoyed at Akira's habit of patronizing brothels. (source: http://en.wikipedia.org/wiki/Futari_Ecchi)
Anju is Karin's younger sister and she absolutely loves her, close to the point of obsession. She will do anything for Karin. She has not quite awakened as a vampire, causing her to be somewhat sensitive to the sun, and resulting in her only attending school on overcast days. However, she does have an amazing control over bats despite this. Anju is very reserved, speaking in a quiet manner and wears a Gothic Lolita attire. Boogie-kun is her companion, whom she carries around and is her favorite of her dolls, something she enjoys collecting. In the anime, Anju's blood preference is jealousy when she awakens. In the manga, it's loneliness.
Typically has a disdain for monsters because her brother's girlfriend is one. Her family has a Borzoi named Torabolt.
Maeda Toshiie's wife, and adopted mother to Maeda Keiji. She is highly intelligent and is equally skilled in martial arts. (Source: Wikipedia)