Steam link and itch.io link.

In an alternate Victorian world, vampires are part of every day life. But when an actual cure to vampirism is discovered, not everyone takes too kindly to the disturbance in the status quo...

Determined to make her own destiny as she turns 18, the young head of her family Lucie plunges headfirst in the conniving world of business dealings. Before she's able to seal the deal on a revolutionary treatment to vampirism, her business partner suddenly dies. Lucie finds herself embroiled in the middle of the mysterious death of her former partner and an event from a decade prior...

Game can stand alone, but is the sequel to a non-otome regular visual novel (shoutout to our friends over at !visualnovels@ani.social) set around 5–6 years before the otome. That visual novel is Crimson Waves on the Emerald Sea. Here's a Steam link and an itch.io link.