This is clearly harem manga without doubt (if it followed the novel version). So why there is no harem tag in here?
Should we wait for it to be happened, then put it afterward?
@gortz, well that's good way to prevent spoilers.
But and sadly I almost missed this manga because I always did harem+isekai on my search query whenever I need new manga to read. Well, that's my rule of thumb though.
But don't get me wrong, I'm not into reverse harem just to be clear ?
@garethgg Eh, I fully expect him to come up with antibiotics like penicillin and somehow heal him up. Because if these Isekai Manga taught me anything, is that all 20 something youngsters in modern Japan have a vast amount of knowledge regarding multiple subjects and know a thing or two about creating medicines.