This is too obvious in the earlier codes to need special illustration. (religion-online.org)
Color images and special illustrations from one of the world's most popular manga are offered in this vivid new art collection. (kuriousity.ca)
Kadokawa has released the first volume of the show's first season on March 27th which included a short story from the light novel's author, special illustrations by Nekosuke Okuma and Yoshiro Watanabe as well as cutscenes not shown in the original TV Broadcast. (goodereader.com)