Kokoro has a stomachache.
It’s a common occurrence for her these days. Strangely enough, it’s only triggered whenever she thinks about rejoining the rest of her peers at school. And as her parents desperately try to figure out why she suffers so, Kokoro hides from the daylight in her dark room.
Kokoro hates disappointing her parents. It’s not like she wants to get sick over school. But ever since the incident (one which she keeps secret from her parents), returning to class seems impossible.
That’s why Kokoro spends the school year in her bedroom. It’s also why she’s there when her mirror begins to shine. And when she touches its surface, she transports to a fantastical castle!
She’s not the only one there. Six other students, roughly her age, have likewise been summoned through their own mirrors. And before them stands a little girl in a dress wearing a wolf mask.
The girl calls herself the Wolf Queen. She tells them that she’s opened the castle to them for the remainder of the school year, and they’re free to do pretty much whatever they want. And (the Wolf Queen tells them) that includes searching for a key which will unlock the castle’s Wishing Room. Whoever can find that key will get to have their wish granted.
Well, Kokoro knows what she’d wish for: something that would make her forget (or at least feel better about) the incident forever. But the Wolf Queen isn’t done talking.
The children may enter and leave it between the hours of 9 a.m. to 5 p.m., Japan time. But they must remember to leave back home before 5 p.m. rolls around each day. Because if they stay in the castle any later, there’s a horrible penalty.
“A simple punishment,” the Wolf Queen says. “You’ll be eaten by a wolf.”