  We present results of radial-velocity follow-up observations for the two
Kepler evolved stars Kepler-91 (KOI-2133) and KOI-1894, which had been
announced as candidates to host transiting giant planets, with the Subaru 8.2m
telescope and the High Dispersion Spectrograph (HDS). By global modeling of the
high-precision radial-velocity data taken with Subaru/HDS and photometric ones
taken by Kepler mission taking account of orbital brightness modulations
(ellipsoidal variations, reflected/emitted light, etc.) of the host stars, we
independently confirmed that Kepler-91 hosts a transiting planet with a mass of
0.66 M_Jup (Kepler-91b), and newly detected an offset of ~20 m s$^{-1}$ between
the radial velocities taken at ~1-yr interval, suggesting the existence of
additional companion in the system. As for KOI-1894, we detected possible
phased variations in the radial velocities and light curves with 2--3 sigma
confidence level which could be explained as a reflex motion and ellipsoidal
variation of the star caused by the transiting sub-saturn-mass (~0.18 M_Jup)
planet.
