In the *Houkago no Kaidan* series: 1) Shisha to no Koushin (Shisha to no Access) 2) Hanaichi Monme

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"

Via https://www.kinokuniya.co.jp/f/dsg-08-EK-0315323 Alice holds two young children before her husband. Her brother-in-law, Toma, who has her feelings for Alice, who is ashamed of her whore's past, offers a small amount of help despite being a student and wants to get married after graduation. However, Alice breaks her vow with her husband to protect her life with her child, and she returns to a whore who is willing to pay a pervert. Forbidden love drawn brilliantly by Junko Okada of "Yoshihara Hana no Ran"!