The Abashiri Family (1991)

The Abashiri family are considered the greatest bandits of all Japan; even though they generally commit robberies, when provoked there is no protection or safety from them. There's the head of the family Daemon Abashiri and his four children from different wives: expert sneak-thief Goemon, muscle-man Naojiro, demolitions expert Kichiza and expert fighter Kikonosuke. But on Kikonosuke's 16th birthday, Daemon makes a shocking revelation: Kikonosuke is in fact a girl, and her late mother had requested as her last wish that she be schooled and educated to grow up a beautiful young woman to lead a normal life. Kiko reluctantly complies, and is sent to Paradise Boarding School to begin a conventional education. But when the school board of Paradise turns out to be a bunch of rapists, psychopaths and otherwise bullies, the blood of Abashiri cries out for vengeance...