Hyperpnoea, Shisshin, the top, madness…. An unimaginable pleasant feeling wraps them up. To the M domain where is forbidden as for the beautiful woman of three provoked in the world of the full-scale hardware BDSM…Mystery to keep living so as to be out of order…Their world changes from this moment. The world of the totally new Ryuubaku which colossal intellect, Manager Kimihide Umiyama hit.