  We report near-infrared (2.5--5 micron) long-slit (~ 30 arcsec) spectroscopy
of a young stellar object in the direction toward the Galactic center with the
Infrared Camera on board the AKARI satellite. The present target is suggested
to be AFGL 2006 based on its very red color and close location. The spectra
show strong absorption features of H$_2$O and CO$_2$ ices, and emission of HI
Br alpha recombination line and the 3.3 micron band, the latter of which
originates from polycyclic aromatic hydrocarbons (PAHs) or materials containing
PAHs. The spectra show a broad, complex absorption feature at 4.65 micron,
which is well explained by a combination of absorption features of CO ice, CO
gas, and XCN, and HI Pf beta emission. The spectra also indicate excess
emission at 4.4 micron. The characteristics of the spectra suggest that the
object is a massive young stellar object. The XCN feature shows a good
correlation with the Br alpha emission, suggesting that the photolysis by
ultraviolet photons plays an important role in the formation of the XCN
carriers, part of which are attributed to OCN$^-$. The 4.4 micron emission
shows a good correlation with the 3.3 micron PAH emission, providing supporting
evidence that it comes from the aromatic C-D stretching vibration. The
formation of OCN$^-$ is of importance for the formation process of prebiotic
matter in the interstellar medium (ISM), while the detection of aromatic C-D
emission provides valuable information on the deuteration process of PAHs in
the ISM and implications on the hiding site of the missing deuterium in the
ISM.
