Unlock Alternate Underwear Set
Hold L + R at the 'Title' screen and then tap the lower half of either of the two main characters (Shinobu or Mayaon) on the touch screen. In total there are five alternate sets (Plain, Striped, Polka-dots, Personal 2, Personal 3) which are selected by performing the action again on the desired set. To return to default you need to repeat up to six times.
We have more cheats and tips for this game here, Gal*Gun: Double Peace cheats
Comments for this cheat