  We discuss the testability of CP-violating phases at future lepton colliders
for the scenario which satisfies electric dipole moment data by destructive
interferences among several phases. We consider the general but aligned two
Higgs doublet model which has the CP-violating phases in the Higgs potential
and the Yukawa interaction. The Yukawa interaction terms are aligned to avoid
flavor changing neutral currents at tree level. The Higgs potential is also
aligned such that the coupling constants of the lightest Higgs boson with the
mass of 125 GeV to the Standard Model (SM) particles are the same as those of
the SM at tree level. We investigate the azimuthal angle distribution of the
hadronic decay of tau leptons arising from production and decay of the extra
Higgs bosons, which contains information of the CP-violating phases. From the
signal and background simulation, we find that the scenario with finite
CP-violating phases can be distinguished from CP conserving one at future
lepton colliders like the International Linear Collider.
