  We present a study of chiral behavior of light meson form factors in QCD with
three flavors of overlap quarks. Gauge ensembles are generated at single
lattice spacing 0.12 fm with pion masses down to 300 MeV. The pion and kaon
electromagnetic form factors and the kaon semileptonic form factors are
precisely calculated using the all-to-all quark propagator. We discuss their
chiral behavior using the next-to-next-to-leading order chiral perturbation
theory.
