Finea

She is the younger sister of Eneus - though they are not blood related, their relationship was close like sisters when Eneus was spending her time in the Demon Realm.

She 'shipped' herself through Postage into the Magical Academy just to free her sister from Professor Sakuma, but the fact was totally the opposite of what she thought.

In the end, she ended up being sent by to the Demon realm by her own sister.