you are already playing subahibi even though you are quite new to VNs wow you have guts (or do you not know what lies ahead of you in the vn lol).
Anyways, to answer your question, I recommend the Muv Luv series because not only is its final game (Muv Luv Alternative) the highest rated vn on vndb, it's also one of the most soul crushing and depressing (to date, it's the only vn I've cried to).
If you want something a bit more light-hearted, I recommend the Grisaia series. It has a balance of funny and serious moments and Angelic Howl (Amane's route) in Fruit Of Grisaia is just incredible. I would also recommend Sharin no Kuni which is similar to Grisaia, but instead of focusing on characters like how Grisaia does, it focuses more on plot.
Other recommendations: G senjou no maou, Ever17, Zero Escape, Danganronpa, Ace Attorney (especially Trials and Tribulations), Steins Gate
I wanted to recommend Fate Stay Night but you said you didn't like magic :/