Shikkoku no Sharnoth -What a Beautiful Tomorrow-
(漆黒のシャルノス -What a beautiful tomorrow-)

The year is 1905 in the capital of the British Empire, the Engine City London, where the air is so thick with smoke that a mere glimpse of the blue sky is considered a miracle. The protagonist, Mary Clarissa Christie, is a girl living by herself while her mother works abroad. She attends university with her friends, Angelica Derleth and Charlotte Bronte, and lives a peaceful life.

However, through a chance encounter, she finds herself drawn into another side of London- spoken of only as rumors of "Metacreatures" who roam the night and attack people. She forms a contract with a strange man in a black suit, known as 'M', and begins to help him hunt these creatures...

Patches are currently available in both English and Chinese. The game has adult content, and thus is not suitable for minors.

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I've only just started this, but so far it's been pretty promising, or at least enough to warrant a thread in my opinion.

Will post additional comments after finishing the game.