 Kozuka was assigned to 2011 Skate America and 2011 NHK Trophy for the 2011–12 Grand Prix season, and he won the bronze medal at Skate America and the silver medal at NHK Trophy.Kozuka earned the silver medal at the 2011 Japanese national figure skating championships, thus qualifying for a spot on the Japanese team for the 2012 World Championships, where he finished 11th.Kozuka began the 2012–13 season by winning gold at the 2012 Skate America and then won silver at the 2012 Rostelecom Cup.