When a girl starts to love you and is about to confess, you will see a dream event. The dream event is different from usual CGs that it will be a CG on both screen. (Regular CGs are only on one screen.) Dream events are different depending on the girl you are after. You have to do different things during the dream too.
For the part that you have to say something, if you can't say it, you can keep touching the screen.
Soon after the dream, you should get confession from the girl you dream of. When she confesses, you will have 2 choices. The top one is accept and the bottom one is reject her confession. (You can reject her to get a "Reject Confession" Memory in the Gallery if you want. But if you don't get another girl to confess to you by day 100, you cannot proceed to play the second part of the game.)
If you say yes when she confesses, you will be able to kiss her when you see a close-up shot. Just touch the screen with your stylus. Then you will see the ending credit while walking home with her. She will ask you 2 questions.
First question is whether she can call you by your first name. (She always calls you with your family name throughout the first part.) Top choice is yes, middle choice is no, and the bottom choice is "..." which I don't know what it means. :P
Later she will ask whether you want to go on a date this coming holiday. Top choice is yes, middle one is no, and again the bottom one is a mysterious "...".
Then you will need to watch the credit and save before proceeding to the next part. And this is it for the first part of the game. After this, you will be playing the Second Part of the game (After Confession).
Note: If you reject her confession, you will continue playing the first part of the game. You might get confession from another girl and proceed to the second part or you will just end up alone on day 100th. If you don't get a girlfriend by day 100th, you will start back on the day you last save your file.
If you can't get a confession by the 100th day, I have some tips for you. ^_^