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The second most significant detection of the Planck Sunyaev Zel'dovichsurvey, PLCK~G287.0+32.9 ($z=0.385$) boasts two similarly bright radio relicsand a radio halo. One radio relic is located $\sim 400$ kpc northwest of theX-ray peak and the other $\sim 2.8$ Mpc to the southeast. This large differencesuggests that a complex merging scenario is required. A key missing puzzle forthe merging scenario reconstruction is the underlying dark matter distributionin high resolution. We present a joint Subaru Telescope and {\it Hubble SpaceTelescope} weak-lensing analysis of the cluster. Our analysis shows that themass distribution features four significant substructures. Of thesubstructures, a primary cluster of mass$M_{200\text{c}}=1.59^{+0.25}_{-0.22}\times 10^{15} \ h^{-1}_{70} \\text{M}_{\odot}$ dominates the weak-lensing signal. This cluster is likely tobe undergoing a merger with one (or more) subcluster whose mass isapproximately a factor of 10 lower. One candidate is the subcluster of mass$M_{200\text{c}}=1.16^{+0.15}_{-0.13}\times 10^{14} \ h^{-1}_{70} \\text{M}_{\odot}$ located $\sim 400$ kpc to the southeast. The location of thissubcluster suggests that its interaction with the primary cluster could be thesource of the NW radio relic. Another subcluster is detected $\sim 2$ Mpc tothe SE of the X-ray peak with mass $M_{200\text{c}}=1.68^{+0.22}_{-0.20}\times10^{14} \ h^{-1}_{70} \ \text{M}_{\odot}$. This SE subcluster is in thevicinity of the SE radio relic and may have created the SE radio relic during apast merger with the primary cluster. The fourth subcluster,$M_{200\text{c}}=1.87^{+0.24}_{-0.22}\times 10^{14} \ h^{-1}_{70} \\text{M}_{\odot}$, is northwest of the X-ray peak and beyond the NW radiorelic.

MC$^2$: Subaru and Hubble Space Telescope Weak-Lensing Analysis of the Double Radio Relic Galaxy Cluster PLCK G287.0+32.9