diff --git a/frontend/src/components/LeftoverMapPlot.comparisonAccessibility.test.tsx b/frontend/src/components/LeftoverMapPlot.comparisonAccessibility.test.tsx
new file mode 100644
index 000000000..941829f0c
--- /dev/null
+++ b/frontend/src/components/LeftoverMapPlot.comparisonAccessibility.test.tsx
@@ -0,0 +1,76 @@
+import { render, screen } from "@testing-library/react";
+import { afterEach, describe, expect, it, vi } from "vitest";
+import type { LeftoverPair } from "../api";
+import { setLocale } from "../i18n";
+import { LeftoverMapPlot } from "./LeftoverMapPlot";
+import { LeftoverPairList } from "./LeftoverPairList";
+
+const PAIR: LeftoverPair = {
+  pair_kind: "closest",
+  post_id: "post-demo-public",
+  post_title: "Public post",
+  criterion_code: "sales_lead_quality",
+  leftover_distance: 0.12,
+  leftover_residual: 0.4,
+  leftover_map_person_axis_1: 0.5,
+  leftover_map_person_axis_2: 0.1,
+  leftover_map_item_axis_1: 0.5,
+  leftover_map_item_axis_2: -0.02,
+};
+
+const PAIR_WITHOUT_PERSON_COORDINATES: LeftoverPair = {
+  ...PAIR,
+  leftover_map_person_axis_1: null,
+};
+
+describe("LeftoverMapPlot comparison post accessibility", () => {
+  afterEach(() => setLocale("en"));
+
+  it("composes the comparison marker name from existing localized copy", () => {
+    setLocale("ko");
+    render(
+      <LeftoverMapPlot
+        pairs={[PAIR]}
+        criterionLabel={() => "sales-lead"}
+        onSelectPost={vi.fn()}
+        variant="comparison"
+      />,
+    );
+
+    expect(
+      screen.getByRole("button", {
+        name: "잔여 지도 비교 그림: 잔여 지도 글 Public post 열기 (ξ (+0.50, +0.10))",
+      }),
+    ).toBeInTheDocument();
+  });
+
+  it("does not invent a post marker when persisted person coordinates are unavailable", () => {
+    const { container } = render(
+      <LeftoverMapPlot
+        pairs={[PAIR_WITHOUT_PERSON_COORDINATES]}
+        criterionLabel={() => "sales-lead"}
+        onSelectPost={vi.fn()}
+        variant="comparison"
+      />,
+    );
+
+    expect(container).toBeEmptyDOMElement();
+  });
+
+  it("keeps the pair-button open action when missing coordinates make the plot non-plottable", () => {
+    render(
+      <LeftoverPairList
+        pairs={[PAIR_WITHOUT_PERSON_COORDINATES]}
+        criterionLabel={() => "sales-lead"}
+        onSelectPost={vi.fn()}
+      />,
+    );
+
+    expect(screen.queryByLabelText("Leftover-map graphic display")).not.toBeInTheDocument();
+    expect(
+      screen.getByRole("button", {
+        name: "Open leftover closest pair: Public post · sales-lead",
+      }),
+    ).toBeInTheDocument();
+  });
+});
diff --git a/frontend/src/components/LeftoverMapPlot.tsx b/frontend/src/components/LeftoverMapPlot.tsx
index 7055679ea..fc3d9b06e 100644
--- a/frontend/src/components/LeftoverMapPlot.tsx
+++ b/frontend/src/components/LeftoverMapPlot.tsx
@@ -42,6 +42,7 @@ import {
   firstPlottablePairForPost,
   layoutLeftoverMapPlot,
   leftoverMapComparePlotCriterionBadge,
+  leftoverMapComparePlotPostBadge,
   leftoverMapPlotCriterionBadge,
   LEFTOVER_MAP_COMPARE_PLOT_CAPTION,
   LEFTOVER_MAP_COMPARE_PLOT_LABEL,
@@ -148,12 +149,31 @@ function leftoverMapPlotCriterionText(
   return `${t("Criterion ζ")} ${badge.values.label} · ζ ${badge.values.item}`;
 }
 
+function leftoverMapPlotPostText(
+  marker: { label: string; axis1: number; axis2: number },
+  variant: LeftoverMapPlotVariant,
+): string {
+  if (variant === "comparison") {
+    const badge = leftoverMapComparePlotPostBadge(marker.label, marker.axis1, marker.axis2);
+    if (badge === null) {
+      return `${t(LEFTOVER_MAP_COMPARE_PLOT_LABEL)}: ${t("Post ξ")} ${marker.label}`;
+    }
+    return `${t(LEFTOVER_MAP_COMPARE_PLOT_LABEL)}: ${tf(LEFTOVER_MAP_PLOT_POST_ACTION, badge.values)}`;
+  }
+  const person = formatLeftoverMapCoordinatePair(marker.axis1, marker.axis2) ?? "";
+  return tf(LEFTOVER_MAP_PLOT_POST_ACTION, {
+    title: marker.label,
+    person,
+  });
+}
+
 /**
  * Gabriel leftover-map graphic display of persisted ``ξ_{1:2}`` / ``ζ_{1:2}``.
  *
  * Person markers are posts; item markers are leftover criteria. Report and
  * comparison criterion markers keep distinct accessible names while composing
- * the already-localized criterion label with persisted ζ.
+ * the already-localized criterion label with persisted ζ. Comparison post
+ * markers name only persisted finite person axes with distinct accessible copy.
  * Click a post marker to open that post. Caption leftover-map axes with persisted
  * Gabriel inertia share when finite, including rank-0 zero-share axes.
  * Report and comparison graphic axes additionally name finite, non-negative
@@ -605,34 +625,28 @@ export function LeftoverMapPlot({
               </text>
             </g>
           ))}
-          {layout.persons.map((marker) => {
-            const person = formatLeftoverMapCoordinatePair(marker.axis1, marker.axis2) ?? "";
-            return (
-              <g
-                key={`person:${marker.id}`}
-                className="leftover-map-plot-marker"
-                role="button"
-                tabIndex={0}
-                aria-label={tf(LEFTOVER_MAP_PLOT_POST_ACTION, {
-                  title: marker.label,
-                  person,
-                })}
-                onClick={() => openPost(marker.id)}
-                onKeyDown={(event) => {
-                  if (event.key === "Enter" || event.key === " ") {
-                    event.preventDefault();
-                    openPost(marker.id);
-                  }
-                }}
-              >
-                <circle className="leftover-map-plot-person-hit" cx={marker.x} cy={marker.y} r={22} />
-                <circle className="leftover-map-plot-person" cx={marker.x} cy={marker.y} r={6} />
-                <text className="leftover-map-plot-label" x={marker.x + 10} y={marker.y - 10}>
-                  {marker.label}
-                </text>
-              </g>
-            );
-          })}
+          {layout.persons.map((marker) => (
+            <g
+              key={`person:${marker.id}`}
+              className="leftover-map-plot-marker"
+              role="button"
+              tabIndex={0}
+              aria-label={leftoverMapPlotPostText(marker, variant)}
+              onClick={() => openPost(marker.id)}
+              onKeyDown={(event) => {
+                if (event.key === "Enter" || event.key === " ") {
+                  event.preventDefault();
+                  openPost(marker.id);
+                }
+              }}
+            >
+              <circle className="leftover-map-plot-person-hit" cx={marker.x} cy={marker.y} r={22} />
+              <circle className="leftover-map-plot-person" cx={marker.x} cy={marker.y} r={6} />
+              <text className="leftover-map-plot-label" x={marker.x + 10} y={marker.y - 10}>
+                {marker.label}
+              </text>
+            </g>
+          ))}
         </svg>
       </div>
     </figure>
diff --git a/frontend/src/leftoverMapPlotLayout.ts b/frontend/src/leftoverMapPlotLayout.ts
index 2810b2303..f70bb98d1 100644
--- a/frontend/src/leftoverMapPlotLayout.ts
+++ b/frontend/src/leftoverMapPlotLayout.ts
@@ -67,6 +67,30 @@ export function leftoverMapComparePlotCriterionBadge(
   return { key: LEFTOVER_MAP_COMPARE_PLOT_CRITERION, values: { label, item } };
 }
 
+export const LEFTOVER_MAP_PLOT_POST_ACTION_OMITTED =
+  "Open leftover-map post {title}";
+
+export const LEFTOVER_MAP_COMPARE_PLOT_POST_ACTION =
+  "Open leftover map comparison graphic leftover-map post {title} at ξ {person}";
+
+export type LeftoverMapPlotPostBadge = {
+  key: string;
+  values: { title: string; person: string };
+};
+
+/** Name only finite persisted comparison-post person coordinates; never infer ξ from item coordinates. */
+export function leftoverMapComparePlotPostBadge(
+  title: string,
+  axis1: number | null | undefined,
+  axis2: number | null | undefined,
+): LeftoverMapPlotPostBadge | null {
+  const person = formatLeftoverMapCoordinatePair(axis1, axis2);
+  if (person === null) {
+    return null;
+  }
+  return { key: LEFTOVER_MAP_COMPARE_PLOT_POST_ACTION, values: { title, person } };
+}
+
 export const LEFTOVER_MAP_PLOT_TICK =
   "leftover-map axis {axis} tick {value}";
 
diff --git a/tests/test_grouping_comparison_graphic_post_person_coordinate_contract.py b/tests/test_grouping_comparison_graphic_post_person_coordinate_contract.py
new file mode 100644
index 000000000..1787cc74a
--- /dev/null
+++ b/tests/test_grouping_comparison_graphic_post_person_coordinate_contract.py
@@ -0,0 +1,49 @@
+"""Executable contract for comparison-graphic post person-coordinate captions."""
+
+from pathlib import Path
+import re
+
+
+ROOT = Path(__file__).resolve().parents[1]
+LAYOUT_SOURCE = ROOT / "frontend" / "src" / "leftoverMapPlotLayout.ts"
+PLOT_SOURCE = ROOT / "frontend" / "src" / "components" / "LeftoverMapPlot.tsx"
+
+
+def test_comparison_graphic_post_names_persisted_person_coordinates() -> None:
+    """Comparison post markers use distinct ξ copy without changing report markers."""
+    layout_source = LAYOUT_SOURCE.read_text(encoding="utf-8")
+    plot_source = PLOT_SOURCE.read_text(encoding="utf-8")
+
+    assert (
+        'LEFTOVER_MAP_COMPARE_PLOT_POST_ACTION =\n'
+        '  "Open leftover map comparison graphic leftover-map post {title} at ξ {person}";'
+        in layout_source
+    )
+    assert "leftoverMapComparePlotPostBadge" in layout_source
+    assert "leftoverMapComparePlotPostBadge" in plot_source
+    assert "LEFTOVER_MAP_PLOT_POST_ACTION" in plot_source
+    assert re.search(
+        r'variant\s*===\s*"comparison".*?leftoverMapComparePlotPostBadge.*?LEFTOVER_MAP_PLOT_POST_ACTION',
+        plot_source,
+        re.DOTALL,
+    )
+
+
+def test_comparison_post_badge_consumes_person_axes_fail_closed_without_item_inference() -> None:
+    """Comparison ξ comes only from finite persisted person axes; zero remains explicit."""
+    layout_source = LAYOUT_SOURCE.read_text(encoding="utf-8")
+    helper = re.search(
+        r"export function leftoverMapComparePlotPostBadge\(.*?\n}\n",
+        layout_source,
+        re.DOTALL,
+    )
+    assert helper is not None
+    helper_source = helper.group(0)
+
+    assert "formatLeftoverMapCoordinatePair(axis1, axis2)" in helper_source
+    assert "person === null" in helper_source
+    assert "return null" in helper_source
+    assert "LEFTOVER_MAP_COMPARE_PLOT_POST_ACTION" in helper_source
+    assert "leftover_map_item_axis" not in helper_source
+    assert "Math.sqrt" not in helper_source
+    assert "Math.abs" not in helper_source