Borei

Coming from someone who enjoyed Grisaia immensely, I am inclined to say yes -- it is that good.

So much hype for this novel, is it really that good or is it like grisaia-no-kajitsu-good?

Just to throw my fellow Japanese learners a bone, there's a great free flash card tool called Anki you guys should check out.  It's more or less a program that you import decks of flash cards into, and then you go through and practice them.  Anki helps you learn your shit via spaced repetition; it begins to repeat cards you struggle with based on the amount of difficulty you had (assuming you answer accurately).
 
Helped a ton when I was learning kana, and there are plenty of decks out there for different levels of Kanji if you're willing to search around a bit.  The dude behind TextFugu (which is another resource I encourage checking out) composed a great Hiragana deck.

Everyone should start telling anyone who asks this that the project is cancelled.
 
Put in some effort, peep.  Everyone else has to trudge through pages of talk about dicks; you can, too.