Ayame

Fragile but beautiful girl with a lonely smile. Utsume introduces her as his new girlfriend, and is caught off guard when they ask her last name; he gives her name as "Kondou", the same name as one of his friends...but only because he could think of no better names in time. It is suggested that her name, "Ayame", is an old and uncommon name. Her black hair and dark red clothing stand out.

Sings beautiful songs, which have the power to resist beings from the other world. She herself was once a creature of this world, and ordinary humans are unable to detect her presence unless introduced to her. Said to be 16 years old but looks two or three years younger. Always nervous and retiring. Few details are provided about her life. It is rare to see or hear of her without Utsume being nearby.

(Source: Wikipedia)