For many centuries, merfolk have lived in the depths of the ocean—4,000 meters below the surface—where humanity cannot find them. However, one mermaid's life is turned upside-down when her best friend falls for a human.
A Sinner of the Deep Sea has finished publishing and it has 20 Chapters. It is also Known as: アビスアジュールの罪人, Sinner of the Azure Abyss, Sinner in The Seabed
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Top 5 Manga Like A Sinner of the Deep Sea (Abyss Azure no Zainin) [2025 List]
5. Angel no Oka
"Angel's Hill" is a fantasy story depicting the stormy life of a mermaid princess, Luna.
Luna is put into a seashell and floated out to the sea because she breaks the rules of the Angel's Island. She is then rescued by humans aboard a ship but sold as a slave. She loses her memory and is treated very badly. Then comes Eiji, the son of the rich Kusahara family. He saves Luna and takes her to Japan. Surprisingly, Luna and Eiji's younger sister, Akemi, look as alike as if they were twins. Akemi, who has a perverse nature, turns into Luna on a whim. Akemi is kidnapped and taken to Angel's Island with Eiji. There, Akemi is almost offered as a sacrificial offering by a female shaman, Pyoma. Meanwhile, Eiji meets Soleiu, Luna's older sister, and together they get involved in the secrets of the island.
(Souce: tezukaosamu.net)
Angel's Hill has finished publishing and it has 7 Chapters. It is also Known as: エンゼルの丘, Enzeru no Oka, Angel's Hill
4. See you later, Mermaid
After meeting in a seaside town during their solo-travels, Kazushi Kimijima and Tatsumi Higaki find themselves as patrons of the same inn. The friendly Kazushi invites the pensive Tatsumi for a drink as a favor for his help during a prior sand-in-eye plight. Kazushi finds out little by little why his new acquaintance is so apprehensive. What will he do when Tatsumi unveils his deepest secret and with it, his deepest fear?
See you later, Mermaid has finished publishing and it has 6 Chapters. It is also Known as: See you later,Mermaid, シーユーレイター、マーメイド, See you later, Mermaid
3. Utakata no Minato
While everyone knows the story of the sea, no one knows the story of the deep sea.
"Minato Wadatsumi" was born and raised in a port town, but unfortunately for him, he has an extreme phobia of fish.
One day Minato comes across a fish out of water that changes his life.
Minato of the Foam has finished publishing and it has 23 Chapters. It is also Known as: ウタカタノミナト, Utakata no Minato
2. Mermaid Boys
The curious prince of the mermaid kingdom, Naru, sees a human girl, Nami, and falls in love with her at first sight. Yearning for her love, he seeks a witch to turn himself into a human! But to gain this form, he has to exchange "something" in return...
Mermaid Boys is currently publishing and has Chapters. It is also Known as: マーメイド・ボーイズ, Mermaid Boys
1. Seto no Hanayome
A young boy gets saved from drowning by a mermaid but, according to mermaid law, if a human sees a mermaid's true form, both have to be killed. The only solution to the problem is for him to marry her. But can they keep her secret from being found out?
Chapter count includes 3 special chapters.
Volume 5 contains the side story "Senjou no Merry Christmas" (瀬戸組〈せんじょう〉のメリークリスマス).
Volume 12 contains the side story "Toki wo Kakeru Shoujo" (時をかける少女).
Volume 13 contains the side story "Mission:Impossible 2" (M:I-2).
My Bride is a Mermaid has finished publishing and it has 79 Chapters. It is also Known as: 瀬戸の花嫁, SetoYome, The Inland Sea Bride
