The Blood Mansion (or the Evil House of Blood in the English dub) is a mansion that acts as the Maruhage Empire's trap. Hatenko lures Bo-bobo and the others there, saying that it is the location of a reception party in honor of Tsuru Tsurulina IV's recent wedding. In truth, it is the base for some of the Maruhage Empire's strongest assassins and one of their top scientists. The mansion itself is a death trap, loaded with traps and evil henchmen in almost every room! It has gained the reputation of being so dangerous, that not even a mouse can escape alive.