 It plays during the fourteenth episode, in a scene between Sayuri and Yuichi.The last time it is heard is during the final episode where Akiko speaks with Yuichi in the same café as before.Another reference hidden in the anime is a homage to "" a title that the Key team had worked on while they were still working for Tactics—Rumi Nanase, one of the heroines in "One", has cameo appearances in several points in the anime.