Review of The Fruit of Grisaia
TLDR: Read the Visual Novels if you want the full experience. Otherwise, this is a passable, if overly condensed, slightly altered, entry point into the series. I don't envy anyone that has to adapt a lengthy, acclaimed visual novel like Fruit of Grisaia into a single 13 episode anime season while having it turn out as good or as fleshed out as the source material, so for what it is, this adaptation tried it's best with moderate success. Most of the core story beats from each route are present, albeit in a heavily watered down and somewhat altered form. This unfortunately means, however, that Yumiko's story,which relies heavily on the romance plot between her and Yuuji, lost the vast majority of it's story progression and interested viewers will need to read the visual novel to truly experience it.
The other routes falter similarly, as none of them get the screen time to truly explore the events and the traumas that caused these characters to behave as they do or the resulting consequences of their actions in many cases.
Amane's route gets the most screen time, and thus ,fares the best. Much of her story involves being immersed over an extended period of time in the struggles and suffering she experienced during that time. Naturally, such an experience is difficult to truly capture in such a short time and so the VN is, again, essential to truly experience this gut punch of a route, but the anime does a decent job of adapting it.
What this show does well is give viewers a compact, animated summary of the comedy and the incredible story that the visual novel does so well.
Overall, this is a decent entry point into the series if you don't want to read the visual novels, but if readers do have any interest at all in the VNs, I would highly recommend skipping this anime and reading the VNs instead, as the stories and characters are far more fleshed out and will have a much greater impact than can be experienced through the very heavily condensed version shown in the anime.
I'd love it if they could take another crack at this in the future with an extended season or maybe several feature length episodes, but I doubt that'll happen. Also, maybe tone down the panty shots too.