There is not really a need for a guide.
To progress with a chara, meet the chara. To progress with the Story you need either progress with the main charas or play a minimum of days or both. Without "skip unseen" setting you always see as soon as you chose an activity/location if there is something new, especially on weekends a not grayed out skip button its an easy indicator to scroll up and pick another option...on weekdays its irrelevant because there is no limit, its just a "speed things up and dont waste weekends" trick without save/load.
You cant miss anything, you only can miss 1 thing so far if you do something you shouldnt do (read the text, if you just skip or do stuff you said/promised you wont do you can miss something).
So there is only one thing left and thats the question "is there anything else or have i done all so far?" and this question is answered by the event tracker at any time of the game for any story and chara of the game. So why sould anyone need a guide here?