Mermaid Observation Diary

One summer, two boys living in a small seaside village find something they'd only heard about in scary stories: a mermaid. The creature they'd fished up looks like a harmless little girl, but its true nature is a man-eating monster…or so they're told. The cowardly Ken and the brash Shun decide to bring her home, agreeing not to breathe a word of this secret to anyone…but have they found a friend or the beginning of a nightmare?

(Source: Yen Press)

Note: Originally self-published on Twitter, was then licensed by Kadokawa for commercial release.