Read the OP in its entirety, click on and read all spoilers (especially the change logs, use them like a road map), in the Extras section download and read the Walkthrough in its entirety, when you have finished the items in the Walkthrough, consult the Guide, again read it in its entirety and consult it when needed during gameplay), it is kindly maintained by Golem98.
Going through the game in any other way you will miss things, searching through the thread for or using the save files found at the end of the Guide will result in missed scenes. There is no comprehensive gallery in the game just a place to re-watch scenes that are not repeatable in game. None of this is meant to be criticism of the game, it is great, just trying to make sure you get the most out of the gameplay!
Should you actually play the game, you can cut down on the grinding (though you will want to do some as it provides context) by choosing the "Spend the day with" option before leaving your bedroom in the mornings, this option will raise the chosen girl's stats by 5 points you will then have to go to bed again (wash, rinse, repeat style), where as the other point raising in game is 1 point per activity, though you can do multiple activities with different girls each day, time wise the "Spend the day with" option is quicker.
Cheers
As always, likes are appreciated!