You have to get all the good endings from each of the characters. Good endings give you regalia, which are the little gold trinkets each character has.

You get Egliette's fork and knife automatically.

To get Fleta's regalia, you have to beat her in all 3 games.

For Harpae you have give her the right answers when you see that her foot is stuck in the floor as follows:

Don't help her
Yes (To hold her hand)
Don't help her
That was dangerous
Rest with her
Hold her hand
Appeal to Harpae

When you get to the room where everything is cluttered, you either push everything out of the way yourself (bad end) or you let Harpae do it (good end). If you let Harpae do it, all you have to do is push a chair out of the way at the end.

For Lisette's regalia, there's only 2 questions you have to answer right. At one point you'll be asked how you know Lisette's name. Answer saying that you remember her name. Then later on you'll be asked whether or not you want to help Lisette, say YES.

And finally for Enjel, in the stained glass hall you'll have to beat her in a race which has 3 parts.

The 1st part is going to be a pain because Enjel’s going to be right on your butt the entire time. Go right at Fleta’s window, go left at Harpae’s window, and just go straight up for Lisette’s window. (It looks like a dead end, but it's not.)

For the 2nd part, you just have to spam "Z" as fast as possible.

And the 3rd part, the best way to win is to hold down “Shift” and run as soon as you finish talking to her.

If you did all that, then "Congrats" you got the good end! X3

After the credits, make another save for the “new game plus” to access the bonus rooms, and celebrate!