Houseki no kuni, it starts off bright and goes heavy on depression and psychological as soon as the MC goes through change/"character development". Very heavy angst.
Hmmm maybe Mahou Tsukai no Yome?? I know you said no romance but romance there is VERY slowburn, imo, both MC and the...ML i guess??? Idk how to call him but the dude isn't human and......
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