  Chiral symmetry is a key to investigating quantum physics, from condensed
matter to particle physics. We propose a novel way of realizing a chiral
fermion, known as the overlap-Dirac operator, without explicitly calculating
the low modes of the Wilson-Dirac operator. We introduce a projection operator
inspired by the Sakurai-Sugiura method and formulate the exact sign function
and overlap-Dirac operator with a contour-integral form. Like the
Sakurai-Sugiura method, the proposing method is multi-scale parallelizable,
which fits the multi-core/multi-GPGPU paradigm. We confirm that the quality of
chiral symmetry realized with the proposed method is sufficient for double
precision. We evaluate the strong scaling of the proposing method.
