A fourth drama CD, titled Sono Christmas Candle no Akari ga Yureru Toki... (そのクリスマスキャンドルの灯が揺れる時…), was released with the special edition of volume 6.5 on July 22, 2014. The fourth drama CD contains a character song by Yukino Yukinoshita and Yui Yuigahama (Saori Hayami and Nao Tōyama), titled "Kimi to Merry Christmas" (君とMerry Christmas).
While Volume 6.5 takes place after Volume 6 and the Culture Festival. Volume 6.5's Drama CD takes place after Volume 9 and Season 2 Episode 10. It provides details about what happens after the Christmas event with the Kaihin Sougou student council and a large portion of Hachiman's Christmas break.