Awakening Darkness. The Betrothed

Against my will, I was taken to a чужой мир. I was made the bride of the lord of darkness and was to be sacrificed. But thanks to the magic I acquired, I managed to escape and even enrolled in... an academy. While I study and try to find a way home.
But they will definitely be looking for me. The minions of darkness and the one to whom I was promised.

Five reasons:
1. From the first pages, the heroine finds herself on the altar. Only it is unclear: a wedding altar or a ritual one.
2. Student romance and confrontation with arrogant classmates.
3. An interesting magic system: to control the darkness, the heroine plays the violin.
4. A whole demon in her admirers!
5. The heroine's mysterious tattoo, which for some reason is growing, and the enigmatic magic of darkness.