Fudanjuku is a Japanese pop group under Teichiku Entertainment Inc.. The group is formed by females, and it serves as the male alter-ego of the Nakano Fujo Sisters (中野風女シスターズ / 中野腐女子シスターズ / 中野腐女シスターズ). They changed the official spelling of their name from 腐男塾 to 風男塾 in 2011 with the graduation of Shijuuin Yousuke.