We measured angular dependences of single-crystal magnetization for the chiral structural molecule-based metamagnet [Mn(hfac)(2)].BNO* (1). This crystal shows remarkable crystal direction dependences of spin flip transition in all crystallographic a, b, and c axes and the transitions are observed at different critical magnetic fields (H vertical bar vertical bar a: 640 Oe, H vertical bar vertical bar b: 1000 Oe, and H vertical bar vertical bar c: 1250 Oe at 2K). These results mean that 1 has independent antiferromagnetic multi-sublattices. We calculated its possible magnetic structure from magnetic data and constructed magnetic structural model.