Yowa no tsuki kana

After Chihaya hears Arata say that he quit playing karuta, she and Taichi make a trip to Arata's home in Fukui. Once they find Arata, Chihaya is thrilled and suggest that they play karuta together again, but Arata turns her down. He's no longer the same boy he used to be. So Chihaya tries to learn the truth—