He then entered Nagasaki Nihon University Junior and Senior High School,[REF] where he continued to play as a pitcher.
In 2011, their team won the Kyushu Tournament championships, but was defeated by Sōka University's Yasuhiro Ogawa in the second round of the Meiji Jingu Tournament, despite Ohsera having delivered 159 pitches in 9 innings and 10 KOs [REF].