The former experiment seeks freedom

Luenstella, a young girl with ghost and sylph heritage, awakens in a strange new realm called Yang, far from her familiar world. After being captured and subjected to dark experiments, she finds herself in an ancient lab beneath the Nirvana Mountain Range. With the collapse of ancient gateways, the war between the upper realms, and merging of the lower realms, Luenstella must uncover the truth and find her way home.

There will be a system, but no romance. The main character is still herself, she hasn't been reincarnated into another world or anything like that.