This is to skip the requirement of playing a perfect round of Heart Catch mode to activate Mero-Mero mode. The code requires you to reach Oppai Rank 120 for the character you want to activate it on first. Go to the Communication Room Choose a character. Press and Hold square (the game will go to wide view mode) Input U U D D R R L L U R D L U on the Directional Pad. A voice clip will play when entered correctly.