Miss Siren

Miss Siren is a Japanese action manga, being published by in Japan and  in the United States since TBD 2017.

Synopsis
Kimie Haruyama after an accidental exposure to mystic material, becomes a siren, using her newfound powers to hunt down villainous monsters.

Main

 * Kimie Haruyama - a ditzy seventeen-year-old girl who becomes a siren after getting into contact with the river of monsters, using her powers to hunt down monsters.

Supporting

 * Jinsuke Nakamoto - Kimie's goofy longtime best friend who sticks by her side, even though she is now a siren.
 * Hizuki Chibana - another of Kimie's friends who is known for her TBD behavior and helps her to fight monsters.

Antagonists

 * Echidna - the mother of all monsters and a major antagonist who was mentioned until Arc 5, when she physically appears.
 * Yui Nagamine - a teacher who is Kimie's first monster as she turns herself into a giant spider-like monster in the second chapter, dying at the end of it.
 * Yui Nagamine - a teacher who is Kimie's first monster as she turns herself into a giant spider-like monster in the second chapter, dying at the end of it.

Chapters

 * 1) /Chapter 1/

Arcs

 * 1) New Power Arc (1-2) - Kimie Haruyama learns she just became a siren. While trying to adjust to this, she learns other monsters exist and decides to hunt down monsters.