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Seine Miyazaki

Seine is a 300 year old immortal girl who hunts creatures called "Mushis" with a Black Snake entity named Aion.


A mermaid that Seine nearly killed and in order to live had to merge with a drowned girl's corpse but in the process lost her voice. She then came onto land and tried to get revenge on Seine and in the process she develops feelings for Tatsuya.

Tatsuya Tsugawa

The classmate of Seine Miyazaki who gets involved in her quest to hunt and eradicate "Mushis".

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