 If you liked
Komi-san wa, Comyushou desu.
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 ...then you might like
Boku no Kokoro no Yabai Yatsu
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Both involve diabetes-including romcom wholesomeness with an introverted character getting to better know an extroverted one. Styles are similar - more than 4-koma but less than full manga.
Komi Can't Communicate & The Dangers in My Heart are both wholesome, non-harem romcoms that leaves you feeling good. Neither is completed yet, so a final score is hard to put on them.
Komi is by every definition too long and the relationship building is too slow, but that series excells with loveable side characters and a male lead that is absolutely fanstastic.
Dangers has a slow start, but accelerates its pace in the relationship building. This manga also have good sidecharacters, but not as many or as goofy as Komi.
I would put both around 7-8/10, which is above the average, slop romcoms on 4-6/10. I will
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