You are walking at the forest enjoying your day. Soon you see a woman with demon wings and horns collapsed on the ground. You decided to cut your walk short and carries the woman to a nearest bench to rest. After giving her a water to drink, she explains that her name is Itsuki and she's a Demon Queen from another world.

Itsuki: "Tch! That blasted hero! Not only he banished me, but he also messed up the banished spell! What kind of hero is he?!"