After only spending 15 minutes and already unlocked all the events of one of the girl, It's pretty safe to say that this squeal is much simpler (which is a good news for most of the people who found the system in the first game a little bit complicated) and a little bit more heavy on the writing.
First of all, characters in this game no longer follows a "schedule" but were instead generated randomly, so if you didn't find somebody just load a save and try again. Secondly most events (except one which I'll mention next) are no longer time and location specific so you no longer need to "hunt" people down to progress the story.
So pretty much like the prequel, each girl in this game features a critical event which determines which route you're into. However unlike the prequel, the storyline is pretty much watered down to nothing and there's really no prerequisite besides
one dialog event. If you bumped into a girl on a specific date(each girl has a specific date) you'll run into an event where the girl asked you for life advise and you're presented with three options - One of them will make her your girlfriend; One of them will leads to her NTR route; One of them does not instantly puts you into one of the two routes but instead, will do a relationship point check you have to determine if you're entering NTR route or not.
And that's basically it.
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If you became her lover just keep talking to her, gift her stuff and date her until her relationship point reaches 100. Since only the first conversation with each character will improve the relationship point and you may only gift to each person once per day, once you've found the girl you're going after and have talked to her you can basically just go back to your dorm and skip the reminding of the day. If it reaches 100 before the 3rd of September, you won. One thing I would mention is that unlike in previous game where you'll have to "chase around" male characters for the NTR route, bumping and talking to other male characters does absolutely nothing in this squeal. In fact if you managed to get into the NTR route of one of the girls (by picking the "bad" option in the event mentioned above), the NTR scenes will automatically unlock themselves at the start of a corresponds day and you don't even have to do anything.