Yukari Mermaid TF (Persona 3) (Patreon)

Tartarus works in mysterious ways. The effects of the dark hour aren't yet fully understood by the SEES. One thing they didn't expect is that prolonged exposure to Tartarus increases their risk of monsterization during the dark hour.

It can happen anywhere, even outside of Tartarus itself. Usually, the monsters residing in Tartarus are purely driven by instinct, but any human that got transformed will largely remain the same.

While her powers become much stronger as a result of the transformation, her mermaid body makes it almost impossible to explore Tartarus on her own. She needs to be carried around by one of the other members which leads to some awkward bat also endearing moments.

Enjoy!~