Kill Time Communication (キル タイム コミュニケーション Kiru Taimu Komiunikeishon) is a publishing company that specializes in adult-oriented material like novels, comics and magazines.
In 2007, under license of Warashi, KTC released the Triggerheart Exelica book "Capture & Guide Book: Archive Anchor", but don't worry it's not an Adult-themed book, think of this one as a mix between an Artbook and a Game guide magazine.