I'm going to recommend the Muv Luv series of visual novels. This is a military sci-fi story where the lead of a slice-of-life harem/romcom finds himself in a war-torn alternate timeline, and has to learn to pilot giant robots in order to fight alongside battle-hardened versions of the girls from his own world. There are 3 parts: Muv Luv (romcom), Muv Luv Unlimited (darker military focus), and Muv Luv Alternative (very dark military/war). Muv Luv Alternative is the #1 ranked VN on vndb.org, with an average score of 9.28. Apparently it's also the highest ranked on the equivalent Japanese site.
The series has many virtues, but also some major caveats.
I'll start with the good stuff:
Downsides:
Neutral elements:
I wasn't sure whether to post about this because of the downsides, but I read it a couple of months ago and it's still on my mind enough to feel worth recommending. I'd strongly recommend it if you have the time to spare and like both military sci-fi and emotion-heavy stories.
Content warning: Explicit sex and violence.
Where/how can one buy this thing?
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