Earn an 'S' rank on ALL Story mode missions and answer with the correct choice when asked questions during some of the missions to unlock the True Ending. If done correctly, Shizuru will help in your fight against the Final Boss and you will receive a Partner Card after completing the game.
If you import a character from the original Phantasy Star Portable you will receive several bonuses. The character from the first game resets its level to 1 and does not retain any experience, your My Synth though will stay the same with her name and class from the first game and you will get the saber named 'Exam' which is very rare and strong and gives a 20% to 60% S.E. Effect (Freeze, Stun, Poison, etc.).