Kono Aozora ni Yakusoku o ( The Promise I made over this Blue Sky) is a Japanese adult visual novel produced by Giga originally released on March 31 2006. The game was ported to the PlayStation 2 in 2007 and the PlayStation Portable in 2009 came with additional content although the adult content was removed. An anime TV series was made in 2007 under the title Kono Aozora ni Yakusoku o: Yokoso Tsugumi Ryo e ( ~~ lit. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Written Work