"R L Katsuzetsu tankyu uta" tells a "talkloid" where Rin and Len talks about their "problems" the Act 1 has. The first example was how Rin was unable to say "shi" from "watashi" and "masshiro" . Before going on to the second example of their "fluency" they talked on how Crypton was making a patch and how they're excited for it.