Maid in Abyss
Maid in Abyss is a Manga/Manhwa/Manhua in (English/Raw) language, Drama series, english chapters have been translated and you can read them here. You are reading Maid in Abyss chapters on https://mangabtt.com, fastest updating comic site. The Summary is
A sea monster girl was washed up on the sea shore and woke up by chance, lost her memory and started a new life as a servant in a big house.