Kaijuu Iro no Shima by Hattori Mitsuru — Ongoing

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Without a single friend, middle schooler Chigawa Kon lives on a small island and laments that she hasn't "fallen in love" yet, unlike her classmates. She often plays by "the Hole", a cave near the sea where a man-eating monster lives, according to folk tales.

One day, as she meets with another girl who accidentally drops her smartphone in the sea, they fall from a cliff together but miraculously survive. It turns out Furuka is also all alone.

Note: The uncle was retconned into an aunt in the volume version. In the magazine version (which the scanlation uses), this change occurs in chapter 15.2.

Volume 1
Chapter 1 released Sep 27 '18
Chapter 2 released Dec 29 '18
Chapter 3 released Apr 11 '19
Chapter 4 released Jun 30 '19
Chapter 5 released Oct 20 '19
Chapter 6 released Jan 7 '20
Chapter 7 released Apr 19 '20
Chapter 8 released Aug 15 '20
Chapter 9 released Dec 23 '20
Chapter 10 released Mar 23 '21
Volume 2
Chapter 11 released Jul 6 '21
Chapter 12 released May 14 '22
Chapter 13 released Jul 30 '22
Chapter 14 released Jul 30 '22
Chapter 15.1 released Oct 1 '23
Chapter 15.2 released Oct 9 '23
Chapter 16.1 released Oct 21 '23
Chapter 16.2 released Oct 29 '23
Chapter 17.1 released Nov 27 '23
Chapter 17.2 released Dec 7 '23
Chapter 18.1 released Jan 7 '24
Chapter 18.2 released Jan 21 '24
Chapter 19.1 released Feb 6 '24
Chapter 19.2 released Feb 25 '24
Volume 3
Chapter 20.1 released Jun 29 '24
Chapter 20.2 released Aug 5 '24
Chapter 21.1 released Aug 30 '24 Violence
Chapter 21.2 released Nov 3 '24