Successfully get 100% in all of the Chapters (not an easy task) and a new picture of Margarette and Dana will replace the one of Eike at the Title Screen. To get 100% in a Chapter, you must view all possible cutscenes in that Chapter. You can tell which ones you haven't seen, because you won't be able to skip them.
To get the extra ending. Get all the endings and save at the end of the game. When the title screen shows up, there should be some new music instead of the old one. Now load your Complete file, and when you get to choose what to say, choose ''Am I dead again?..'' then ''Oh, Homonculus''. This will trigger the extra chapter.
After the cutscene, go to the fortune teller and talk to her. Then go to the square and talk to yourself (the juggler). Run to the Bar and talk to the boy, sitting there. Choose not to go in and go to the café. You'll get the red stone and the lighter. Go to the square and talk to yourself again. You'll get the egg ornament. Go back to the bar, and go in. Travel to the time of margarete and look at the cutscene. Now you can either go to Margaret's home or travel back to your time. Either way, you'll finish the game and get an extra ending.
Beat the game on any Ranking and get an Extra Option.
On Extra Option: Movies, End Files, and Result will be opened.
In Result you can check your Achievement percentage to determine how much of the Chapter you have completed.
In chapter 7, just after being pushed off the tower. Do not travel through time to try and change your fate; instead walk to the top of the tower to witness a repeat of being pushed off. After being lectured by Homunculus you will respawn again in the tower, repeat the process. Every time you kill Eike you will receive a free energy crystal for the digipad. You can repeat this trick until you have full energy. Also the trick does not affect your game time or score as the clock is reset to 1am every time you die so you have just as much time to finish the level.
Complete the game with all six endings, including Extra Ending, for the final movie from the autumn Tokyo Games Show 2000.