Isekai'd Into a Harem Anime I've Never Watched

Sun Jing was an ordinary high school girl-quiet, serious, and seemingly responsible-until a freak accident in her bathtub ended her life. She wakes up in an unfamiliar world, one that looks like an anime she's only ever heard about: Highschool DxD. Except she's never watched it, knows nothing about and desperately wants to go home.

To make matters worse, a mysterious "System" has attached itself to her, offering guidance-but often in confusing, cryptic, or downright dangerous ways and giving her strange quests.

"This isn't good. This isn't good at all. I'd like to go back home actually."

(Mc is a futa, don't like it don't read it.)