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There is no way to choose a favorite, so here is a small list:
Basically anything by yamashita tomoko
Endless World by jaryuu dokuro
Future Lovers by kunieda saika
The first story in Merry Family Plan by morozumi sumitomo
Blue Sky Complex, and most others by ichikawa kei
Shoowa, you know, just in general.
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Oh, and you know what? Let's throw Kumota Haruko on there as well. I'm not sure if it's the pure shock or what, but I thought My Darling Kitten Hair would be the stupidest thing, but it is imho more realistic(other than the "gay for you" aspect which I'm not a fan of) than 99% of manga, and is actually quirky and fun.
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Oh I know, that two chapters of flashback were too tought for me too but necessary for the sake of the plot in my POV afterwards things became so sweet and tender that I melt. But ofc its goes with tastes Im not good with stories with child abuses background either so I use to skip that ones but this is a rare exception because is well written (like saezuru)
Only you only is a gem and not so known buy readers in general, maybe because is mature, idk.
I just read that 1st story of Meery Family Plan, the ony one of your rec I didnt read, and its beautiful, thanks :)
Recommended mw you top 1 yaoi manga..pretty please!!!!