  Lightly-doped La$_{2-x}$Sr$_x$CuO$_4$ in the so-called "insulating"
spin-glass/diagonal-stripe phase has been studied by angle-resolved
photoemission spectroscopy. A quasi-particle (QP) peak crossing the Fermi level
has been observed in the node direction of the d-wave superconducting gap,
forming an "arc" of Fermi surface consistent with the recently observed
metallic transport behavior at high temperatures of lightly-doped materials.
The spectral weight of the nodal QP smoothly increases with hole doping,
corresponding to the $n \sim x$ behavior of the carrier number in the
underdoped and lightly-doped regions.
