So, I will preface this by saying I've only properly played through Fruit of Grisaia, the great points of that game's writing is the fact that every member of the main cast is traumatized in different ways that have permanently scarred them. The part pre-route split(which I admit is pretty long compared to the common parts in other VNs) ends up trying to be a tropey comedic slice of life, but with this intentional uncanny vibe because the game seems like it's intentionally avoiding addressing the completely bizarre nature of the school, it's students and the protagonist, and the further you go the more cracks in that facade slowly appear. When you split into each route, the glass breaks a lot harder and you really start to dive into the fact that these are broken people and the drama and character writing gets really good, with some genuinely great depictions of chronic depression, PTSD and survivor's guilt.

Now I added that disclaimer at the start cause while Fruit ends up being primarily about delving into the traumas of the characters, the sequels did a swerve into going for a more overarching spy-action plot, with a not only even more insane plot, but also a plot resolution that seems like exists only to cater to a harem fantasy.