I would highly recommend at least picking up Fruit of Grisaia and seeing if you enjoy that.
Fruit is a comedy/drama/tragedy visual novel which can be roughly summarized as secret-agent-man (not a spoiler) playing therapist for a cast of troubled girls, with a lot of loosely connected comedy in the common route and a lot of drama and tragedy in each of the character routes. Personally I really enjoyed the common route and found the character routes to be very impactful, so much so that Fruit is one of my highest rated reads. It does have some significant issues, such as the fact that the protagonist basically embodies the Navy Seal copy-pasta, the fact that one route inexplicably veers into an odd direction (with paranormal elements), and the fact that the common route is a lot of slice-of-life comedy (it is about as long as any of the character routes).
The sequel, Labyrinth of Grisaia, details Yuuji's past in the form of extended flash-backs and felt like a significant step down from Fruit, mainly because of my being much less interested in Yuuji as a character and because very little happens outside of the flashbacks. It does contain after-stories for each of the character routes in Fruit, all of which were very enjoyable, as well as a large number of disconnected sketches of varying quality. I have yet to read Eden, but the cheaper VNs (Leisure, Afterglow, Melody) are rather forgettable bonus-stories interspersed between the main entries.
There are also two spin-offs, namely Phantom Trigger, a series set in the same universe but following a completely different cast of characters (not on sale), and Idol Magical Girl Chiru Chiru Michiru, a two-part VN that originally started out as an Aprils fools' joke, in which Michiru is re-imagined as a magical girl (currently 50% off).
The games are all extremely well made from a purely technical stand-point and the translations are really good.
Finally, note that the Steam versions are all "all ages", with fade-to-blacks where the original stories had H-scenes and the bonus H-scenes (Professor Dave's Masturbation Corner) have been cut entirely. There's still a lot of lewd humor and sexual innuendo though. There are also no patches, as the Steam versions are based on a separates (Vita?) versions that added additional/alternative CGs instead of the H-scenes, and no combined version exist.