A dark, shut-up classroom after school. On a desk placed in the center lies a single sheet of paper. In the middle are "Yes" and "No," along with the characters from "a" to "n," and at the very top, a red torii gate is drawn.

The girl sitting before you—Kuroha Yayoi—gently pulls up the sleeve of her jet-black gothic lolita dress adorned with frills and lace, and smiles sweetly. But for some reason, you can't shake the feeling that the forearm glimpsed from that cuff is carved with sharp, beautiful cuts.