Kantai Collection
In September 2013, it was announced that there would be a collaborative project between the "Arpeggio of Blue Steel" anime and the online game "Kantai Collection". Illustrators for Kadokawa Games, including Shibafu and Konishi, are responsible for drawing some of the end cards, which feature crossovers with "Kantai Collection" characters. An "Arpeggio of Blue Steel" in-game special event for "Kantai Collection" also took place from 24 December 2013 to 6 January 2014.