After completing the second endings with both Kisuke and Momohime, the white barriers on the map will disappear. You will be able to face the Bosses from both characters' Story mode again. Defeat the following Bosses to unlock the corresponding accessories:
If you are relying on the main-screen's "expanded map" (not the map from the sub-screen), you can scroll the map left and right without moving Momohime or Kisuke. To do this, have them kneel down, then press left and right (on the diagonals) to get your bearings.