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We report the discovery of Serenity-18, a galaxy at z=5.939 for which wecould measure the content of molecular gas, M(H_2)~ 5 x10^9 M_sun, traced bythe CO(6-5) emission, together with the metal-poor ([Fe/H]=-3.08 +- 0.12,[Si/H]=-2.86 +- 0.14) gas clump/filament which is possibly feeding its growth.The galaxy has an estimated star formation rate of ~100 M_sun yr^{-1}, implyingthat it is a typical main sequence galaxy at these redshifts. The metal-poorgas is detected through a damped Lyman-alpha absorber (DLA) observed at aspatial separation of 40 kpc and at the same redshift of Serenity-18, along theline of sight to the quasar SDSS J2310+1855 (z_em = 6.0025). The chemicalabundances measured for the damped Lyman-alpha system are in very goodagreement with those measured for other DLAs discovered at similar redshifts,indicating an enrichment due to massive PopII stars. The galaxy/Damped systemwe discovered is a direct observational evidence of the assembly of a galaxy atthe edge of the reionization epoch.

Witnessing galaxy assembly at the edge of the reionization epoch