A Monster Wants to Eat Me by Naekawa Sai — Ongoing

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High school girl Hinako is living a quiet life in a seaside town, but she feels somewhat detached from her friends during the summer months when she is reminded of when her family died years ago. One day, she meets Shiori, a mysterious girl who reminds her of the ocean, especially when it comes to her translucent blue eyes, but Shiori soon reveals that she is actually a mermaid who has been looking for Hinako for a long time.

Volume 1
Chapter 1: A Suicidal Girl Awaits the Sea released Aug 29 '20
Chapter 2: The Unknown Below Leaf-filtered Sunlight released Sep 28 '20
Chapter 3: The Monster at Sunset and Festival Music released Oct 31 '20
Chapter 4: Bloom At Night and Scatter in the Sea released Nov 29 '20
Volume 1 extras released Aug 19 '21 Food
Volume 2
Chapter 5: Ocean of Hope released Dec 30 '20
Chapter 6: Things That Change and Things That Don't released Feb 2 '21
Chapter 7: Memories With You released Mar 1 '21
Chapter 8: The fragile ties that bind released Jul 25 '21
Chapter 9: What's left of your prayer is a promise released Dec 4 '21
Volume 2 extras released Nov 13 '21
Volume 3
Chapter 10: The gentle caress of light released Dec 14 '21
Chapter 11: My beloved monster released Dec 28 '21
Chapter 12: The gulf between us released Jan 10 '22
Interlude: The shape of my love released Feb 5 '22
Chapter 13: The summer sun and the distant clouds released Feb 28 '22
Volume 3 extra: The swaying summer shadows released Mar 25 '22
Volume 4
Chapter 14: Hot rain on her scar released May 21 '22
Chapter 15: Where the heart is released Jun 21 '22
Chapter 16: Her kindness released Aug 2 '22
Chapter 17: The flipside of humanity released Aug 27 '22
Chapter 18: An indistinct interior released Dec 17 '22 Violence
Volume 4 extras released Jan 3 '23
Volume 5
Chapter 19: The shattered beginning released Jan 24 '23
Interlude: The wounds of regret released Feb 11 '23
Chapter 20: The fingertip of the iceberg released Mar 4 '23
Chapter 21: A prayer in ashes released Mar 27 '23