3D Material is a set of two one-shots centering around romance and drama, aimed at a josei (older female) audience. Story 1 is easily the most compelling, with two character embroiled in a bitter love triangle with plenty of angst to go around. I recommended the manga with Nana for that reason. Story 2 was terribly confusing for me and I wouldn't recommend it to anyone.
Artwork is pretty bad as well, so this is one I'd probably skip on.
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