STRAY LITTLE DEVIL (Sutorei Ritoru Debiru), by Kotaru Mori. First published in 2004 and first published in North America in 2006.
PLOT:
Pam Akumachi was always told by her grandmothers that nice devils were real. They even taught her a spell to summon them. When Pam finally tries to use it, though, she ends up getting sucked into another world full of devils and angels. She discovers that she has been transformed into a devil and gets attacked by an angel that looks just like her best friend. Now the only way for Pam to get back to her world is to become a full-fledged devil and that means starting from the beginning. She has to learn to read their language, work her way through the demonic ranks, and find a familiar, even if she has to shake up a few rules to do so.
