Cosmic buildup of BH mass versus stellar mass of our simulated galaxies, denoted by the blue circles, in run BHs5e0.1v5, each panel indicating one redshift: z = 5, 3, 2, 1, 0.5, 0. The black lines mark the observed BH mass versus galaxy stellar mass relation for local galaxies, showing correlation with the bulge mass as solid (Marconi & Hunt 2003), dashed (McConnell & Ma 2013), and dotted (Reines & Volonteri 2015) lines. The relation for quasars at z ∼ 6 (Wang et al. 2010) is shown as the dash-dotted line.