Lepton flavor violating decay of muon is one of the best probes for physics beyond the Standard Model (BSM). A golden channel, $\mu\to e\gamma$, will be searched by the MEG II experiment. MEG II aims to search $\mu\to e\gamma$ with ten times better branching ratio sensitivity than MEG, $6 \times 10^{-14}$ (90\% C.L.). Many well motivated BSM theories predict sizable branching ratio of this decay (e.g. $\mathcal{O}(10^{-14}$) in SUSY-seesaw), which is within the reach of MEG II.
MEG II utilizes world's highest intensity continuous $\mu^{+}$ beam ($7 \times 10^{7}$ muons/s) at Paul Scherrer Institute (PSI). In order to cope with extremely high rate accidental background of $e^{+}$ and $\gamma$, all the detectors are upgraded from MEG. Detectors are installed and commissioned with muon beam at PSI. We present the status and prospect of the MEG II experiment.