Evolution of fully retrograde systems (initial ψ_⋆ = 180°) during Roche-lobe overflow. Two examples are displayed: a very fast rotator (solid lines, with P_⋆ = 1 day; L < S_⋆) and moderately fast (dashed lines, P_⋆ = 5 days; L ∼ S_⋆). This example uses an initial planet mass and entropy 150 M_⊕ and S = 8 k_B/m_H respectively, Q_⋆ = 5 × 10⁴, and employs a variable angular momentum transfer fraction, β(R_A). Stellar spin-down during orbital inspiral drives the system into alignment; global maxima and minima in P_⋆ and S_⋆, respectively, correspond to reversal in the direction of S_⋆ (P_⋆ → ∞). Stars can rotate slowly after Roche-lobe overflow, if systems begin strongly retrograde.