December 22nd: It's Cause I'm Your Big Sister / December 21st-24th: Faint Memory of a Song

December 22nd: Yuno, Miyako and 2 of their classmates visit Yoshinoya to help her clean up some old art books. Whilst there, they meet an unexpected visitor. December 21st-24th: The girls are preparing for their Christmas Party at Hidamari Apartments. Sae invites Natsume, remembering that she had wanted to visit before.