13 endings?! Will there be some advices how to collect them all?
Also is getting all 3 stars necessary? Looks like it is pure luck once again but I like this game in terms of gameplay perhaps the most thus far, art is also very pretty
Stars unlock new boosters at the start of the game. After you clear the game once, there's a gallery that gives hints for how to find various events and endings.
The greyed out icons you see when starting a new game. They help make various parts of the game easier on subsequent playthroughs and unlock extra features. There are also several starting classes that unlock as you get different endings.