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YZ Ret is the first X-ray flash detected classical nova, and is also wellobserved in optical, X-ray, and gamma-ray. We propose a comprehensive modelthat explains the observational properties. The white dwarf mass is determinedto be $\sim 1.33 ~M_\odot$ that reproduces multiwavelength light curves of YZRet, from optical, X-ray, and to gamma-ray. We show that a shock is naturallygenerated far outside the photosphere because winds collide with themselves.The derived lifetime of shock explains some of the temporal variations ofemission lines. The shocked shell significantly contributes to the optical fluxin the nebular phase. The decline trend of shell emission in the nebular phaseis close to $\propto t^{-1.75}$ and the same as the universal decline law ofclassical novae, where $t$ is the time from the outburst.

A multiwavelength light curve analysis of the classical nova YZ Ret: An extension of the universal decline law to the nebular phase