Thanks man. I really like the concept of the game, and the juggling of resources looks surprisingly detailed for a porn game, I'm just worried 30 days isn't enough to max out the relationships with homework, money. But I'd also like to decide how to purchase the skillsIt's not that grindy... If you are playing for the first time and don't know the tricks I recommend focus your first playthrough on the 3 main characters and then on NG+ focus on the secondary.
If you don't want to grind anything at all... go to the shrine in the mountain and drop coins for 21+ days (it unlocks a button on the free mode that unlocks everything)