Himitsu – Kuro no Chikai

Berdasarkan lagu Vocaloid yang populer.

Alternatif: 秘蜜 黒の誓い, Alluring Secret - Black Vow, Alluring Secret ~Black Vow~, Himitsu ~Kuro no Chikai~

Tipe: Light Novel

Bahasa Asli: Japanese

Status: Completed

Tahun Rilis: 2012

Genre: Drama, Fantasy, Gender Bender, Romance, Supernatural, Tragedy

Score: 7.5

Tags: Angels, Based On A Song, Forbidden Love, Gender Transformation, Heaven, Human-Nonhuman Relationship, Unrequited Love, Unrequited Love Becomes Requited, Vocaloid