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Even over relatively recent epochs, galaxies have evolved significantly intheir location in the mass-metallicity plane, which must be telling ussomething about the latter stages of galaxy evolution. In this paper, weanalyse data from the LEGA-C survey using semi-analytic spectral andphotometric fitting to determine these galaxies' evolution up to their observedepoch at $z \sim 0.7$. We confirm that, at $z \sim 0.7$, many objects alreadylie on the present-day mass-metallicity relation, but with a significant tailof high-mass low-metallicity galaxies that is not seen in the nearby Universe.Similar modelling of the evolution of galaxies in the nearby MaNGA surveyallows us to reconstruct their properties at $z \sim 0.7$. Once selectioncriteria similar to those of LEGA-C are applied, we reassuringly find that theMaNGA galaxies populate the mass-metallicity plane in the same way at $z \sim0.7$. Matching the LEGA-C sample to their mass-metallicity "twins" in MaNGA atthis redshift, we can explore the likely subsequent evolution of individualLEGA-C galaxies. Galaxies already on the present-day mass--metallicity relationform few more stars and their disks fade, so they become smaller and morebulge-like. By contrast, the high-mass low-metallicity galaxies grow theirdisks through late star formation, and evolve rapidly to higher metallicitiesdue to a cut-off in their wind-driven mass loss. There are significantindications that this late cut-off is associated with the belated end of strongAGN activity in these objects.

Where have all the low-metallicity galaxies gone? Tracing evolution in the mass--metallicity plane since a redshift of 0.7