  We present the results of $Suzaku$ and $XMM-Newton$ X-ray observations of the
cluster pair 1E2216.0-0401 and 1E2215.7-0404. We discover an X-ray bridge
between the clusters. $Suzaku$ and $XMM-Newton$ observations revealed that each
cluster hosts gas with moderate temperature of $kT_{1E2216.0-0401}=$4.8$\pm$0.1
keV and $kT_{1E2215.7-0404}=$5.8$\pm$0.2 keV, respectively. On the other hand,
the bridge region shows a remarkably high temperature ({\it kT}=6.6$\pm$0.5
keV). Furthermore, at the position of the bridge, we detected an enhancement in
the wavelet-decomposed soft-band (0.5-4.0 keV) $XMM-Newton$ image at 3 sigma
significance, this is most likely due to a compression of the intracluster
medium (ICM) as a consequence of the merging activity. This X-ray intensity and
temperature enhancement are not consistent with those expected from a late
phase, but are in agreement with the predictions by numerical simulations of an
early phase merger. From the temperature jump at the location of the bridge,
the Mach number is estimated to be ${\cal M}=1.4\pm0.1$, which corresponds to a
shock propagation velocity of about 1570 km/s. From the shock properties, we
estimate that core-passage will occur in 0.3-0.6 Gyr and that the age of the
shock structure is 50--100 Myr. Based on the measured properties of the ICM at
the bridge and estimation of timescales, we find indications for
non-equilibrium ionization. We also discover possible diffuse radio emission
located between the merging clusters. Combining the radio, X-ray, and optical
image data, we speculate that the detected radio sources are most likely
related to the merger event. Thus, 1E2216.0-0401 and 1E2215.7-0404 is a new
example of an early phase cluster merger with remarkable characteristics.
