21. てらされちゃった (I Was Brightened)
22. まもちゃった (I Protected)

The bonus drama CD starts off with a letter Chihaya sends Kazuki soon after he returns home from Kyoto asking how he is. Kazuki replies. This exchange continues for a bit. Kazuki writes that he thinks somebody has been reading the letters. She then gets a response letter from Yuuna explaining that Nakamaru has been reading the letters. Chihaya returns the letter. Kuriko writes. Chihaya responds. Rin then writes. Kuriko writes. Elizabeth writes. Chihaya writes... The pace quickens. They pretty much talk about gifts from and to Kyoto. Kazuki then finally writes and Chihaya figures out that Kazuki hasn't been the one writing letters after all (we, as listeners know who it is, but since Chihaya is reading, she wouldn't) and decides to come visit. Kazuki then finds his girls writing a letter in his room posing as him telling Chihaya not to come. They then hear a knock on the door.