Mother and daughter prisons, mermaids and human promises, and memories and joys that fill the sea and land. Three stories of the sea that impress you. Is that a mermaid in the ocean? Or is it a human who got a fish tail in exchange for something important? The story of the sea that strikes Madoka Kawaguchi's heart.  Recorded works •"Desert of the sea" •"Sound of the sea" •"Stars falling in the sea"

Vol. 1: Onna no Mondai Teiki (2002) Vol. 2: Onna no Mondai Teiki Sex Hen (2002) Vol. 3: Onna no Mondai Teiki Jiken-hen (2003) Vol. 4: Onna no Mondai Teiki Kekkon Trouble Hen (2004)

Prequel to *Natural Selection* in the anthology [Saruya Hachi version Non-coupling Hachimaru](https://www.mangaupdates.com/series.html?id=128834)

Prequel to *I Will Never Make You Unhappy* published in [M‐8 CHRONICLE 2001‐2005](https://www.mangaupdates.com/series.html?id=128831)