That's what I assumed was going on. My French isn't great.
I didn't play the game very much until the translation was kindly provided. But the $30 date is the only action I found in the coding to concern shopping. So I think it's the same.
Maybe the character recieves news about returning to France and therefore has to make a commitment to one girl. I did think it kind off odd when someone moves in with you, they don't ask where you've been and why you're trying to talk to other girls in their presence.
Trying to take my cues from what was already coded into the game. It's not my game after all. He could have meant you can get engaged to just one girl. Or you can get engaged to all the girls as a sort of harem route. The character could be just a romantic who gets engaged to all of them and then the girls make him decide at the end. I found it odd to be able to flirt in front of a girl who's relationship status is girlfriend or even higher. But it would be a pain to code. And arranging more alone time in the girl's schedules would depend too much on the player's choices. I've added the opportunity in my revision to check on what the girl's level is at any time. It hurts the need for the diary but you need this info more often than the diary provides I think.
Also I've played in the regular football games but am not sure what happens if I played in a championship game. It's almost as though that option should be left until the last week where the post match celebrations either involve you making a choice or having a choice made for you maybe with more than 1 girl (not sure if pictures of more than 1 girl are available, probably are if the girl are from the same company as Alison) which would be a nice climax - the college would at least expect you to spectate so even if you didn't play you are still there with the girls.
The championship is on day 98 but only if you have at least a certain number of wins during the game. The character is rewarded with bonus points for each girl if I remember correctly. A little late to do much with them other than have a girl reach fiance level. I like your suggestions. The coding could be adjusted to make the game occur regardless. The game could mark the end of the school year. The girls are all going in different directions and insist that he has to choose one. So he can choose a favorite or refuse to choose. Traveling the world with a finance in every port kind of thing.