Sinostra is one of seven active houses at Darkwick Academy, advised by Professor Hyde. Led by Captain Taiga Hoshibami and Vice Captain Romeo Lucci, the house is defined by its "mafia-like" mentality and students who are powerful, decisive, and value challenges. The dormitory is a grounded luxury cruise ship in a vast desert, which also houses a six-month-old, academy-sanctioned casino. This casino serves as a hub of jazz and clinking coins, employing students from various houses as floor staff.