After making a deal with God, she is reincarnated into a new world fully ready to dedicate her life to her younger sibling. However, things aren't so simple when she attracts the attention of the Emperor.
Not bad but the story isn't the best.
Destined lovers, soul mates. Magic and holy powers. Devils as mindless demons. Scary empire isn't a bad guy only an asswhole in the beginning for some random reason. Main character does really nothing but be pretty.
The Emperor's Companion