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Vertical Inc, headquartered in New York, United States, is a Japanese novel and manga company founded in 2001 by Hiroki Sakai. In February 2011 the company was bought by Kodansha (46.7%) and Dai Nippon Printing (46.0%).
Vertical is currently publishing Paradise Kiss with the first volume released on September 25, 2012. The second and third volumes are slated to be released on December 4, 2012, and March 5, 2013.