  I clarify how the concept of quark-hadron continuity, which was previously
considered in the context of the asymptotic color-flavor locked phase with
ideal three-flavor symmetry, is applied to two-flavor matter. Our observation
is that neutron star matter can continuously be connected to two-flavor
color-superconducting (2SC) phase with an additional condensate of $d$-quarks
in the $^3P_2$ channel. I discuss here two aspects of this novel phase. First,
I introduce the notion of continuity based on the patterns of symmetry breaking
and the corresponding order parameters, and then explain qualitatively the
physics mechanism of $d$-quark $^3P_2$ pairing in analogy to nuclear physics.
Our finding serves as the theoretical underpinning for the phenomenological
construction of the equation of state in the neutron star environment.
