Акико Кирю

Appears in Mermaid's Gaze. Shingo's older sister. Akiko blamed herself for her brother's violent behavior and intended to perish alongside him in a double suicide through ingesting "poison" (mermaid's flesh), but was the only one who ended up dying. A "doll" was made in her likeness, which Shingo attempts to get his hands on a century later, claiming that the "doll" is his sister's body, which was encased and preserved in wax after it was found to not be decaying. After Yuta decapitates the "doll", Shingo picks up its head and discovers that it had been a wax doll all along.