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We analyzed data from HaloSat observations for five fields in the Galacticdisk located far away from the Galactic center (135$^{\circ}$ $<$ $l$ $<$254$^{\circ}$) to understand the nature of soft X-ray energy emission in theGalactic disk. The fields have 14$^{\circ}$ diameter and were selected tocontain no significant high-flux X-ray sources. All five HaloSat soft X-rayenergy spectra (0.4--7 keV with energy resolution of $<$100 eV below 1 keV)show a possibility of the presence of unresolved high-temperature plasma in theGalactic disk (UHTPGD) with a temperature of 0.8--1.0 keV and an emissionmeasure of (8--11)$\times10^{-4} \rm cm^{-6} pc$ in addition to the soft X-raydiffuse background components mainly studied at higher galactic latitudes(solar wind charge exchange emission, local hot bubble, Milky Way haloemission, and the cosmic X-ray background). This suggests that the UHTPGD ispresent across the whole Galactic disk. We also observed UHTPGD emission in aregion with no bright sources in an {\it XMM-Newton} field contained within oneof the {\it HaloSat} fields. The temperature and emission measure areconsistent with those measured with {\it HaloSat}. Moreover, the stackedspectra of the X-ray point-like sources and NIR-identified point sources suchas stars in the {\it XMM-Newton} field also show a spectral feature similar tothe UHTPGD emission. This suggests that the UHTPGD may partly originate frompoint-like sources such as stars.

Soft X-ray Energy Spectra in the Wide-Field Galactic Disk Area Revealed with HaloSat