Chikaru's school life begins to change with the arrival of a transfer student named "Chiya Yorune" in his class.

The girl is shy and often acts strangely. Initially, Chikaru treats her like a new kid and simply accepts it.

However...
As time goes by, he realizes that there's something a little strange about Chiya. Unbeknownst to him, his closeness to her slowly drags him into the mystery of the cat spirit curse that lurks deep within Chiya.