diff --git a/Sources/MapConductorCore/marker/StrategyMarkerController.swift b/Sources/MapConductorCore/marker/StrategyMarkerController.swift
index d1653e4..0a7d32c 100644
--- a/Sources/MapConductorCore/marker/StrategyMarkerController.swift
+++ b/Sources/MapConductorCore/marker/StrategyMarkerController.swift
@@ -138,8 +138,27 @@ where Strategy.ActualMarker == ActualMarker, Renderer.ActualMarker == ActualMark
         }
     }
 
+    /// 他の 5 種類・``AbstractMarkerController`` の clear() と同じく
+    /// 「onRemove(全部) → 空にする → onPostProcess」の順に呼ぶ。
+    ///
+    /// 以前は `strategy.clear()` で manager を空にするだけだった。GL 系の描画担当は
+    /// onRemove では地図に触らず onPostProcess で manager から描き直すので、呼ばないと
+    /// clear() の後もマーカーが地図に残る。空にするのは `strategy.clear()` のままにして、
+    /// ストラテジ固有の後片付け（クラスタの状態など）を保つ。
+    ///
+    /// **permit の中で行う。** `pendingStates` を触るため（上の ★ を参照）と、
+    /// add / カメラ変更のストラテジ処理と交錯させないため。
     public func clear() async {
-        strategy.clear()
+        await semaphore.withPermit {
+            let entities = markerManager.allEntities()
+            if !entities.isEmpty {
+                await renderer.onRemove(data: entities)
+            }
+            strategy.clear()
+            // 最初のカメラ待ちで保留していたものも消す。残すと次のカメラで描かれてしまう。
+            pendingStates = nil
+            await renderer.onPostProcess()
+        }
     }
 
     public func find(position: GeoPointProtocol) -> MarkerEntity<ActualMarker>? {
diff --git a/Tests/MapConductorCoreTests/StrategyMarkerClearOrderTests.swift b/Tests/MapConductorCoreTests/StrategyMarkerClearOrderTests.swift
new file mode 100644
index 0000000..6f88800
--- /dev/null
+++ b/Tests/MapConductorCoreTests/StrategyMarkerClearOrderTests.swift
@@ -0,0 +1,118 @@
+import XCTest
+
+@testable import MapConductorCore
+
+/// ``StrategyMarkerController/clear()`` は他のコントローラの clear() と同じく
+/// 「onRemove(全部) → 空にする → onPostProcess」で、何も描かれていない状態で終わること。
+///
+/// 以前は `strategy.clear()` で manager を空にするだけで、onRemove も onPostProcess も
+/// 呼ばなかった。GL 系の描画担当は onPostProcess で manager から描き直すので、
+/// clear() の後もマーカーが地図に残る。android-sdk-core / js-sdk-core の同名テストと同じ。
+final class StrategyMarkerClearOrderTests: XCTestCase {
+    private let camera = MapCameraPosition(
+        position: GeoPoint(latitude: 35.0, longitude: 139.0),
+        zoom: 10,
+        visibleRegion: VisibleRegion(bounds: GeoRectBounds(
+            southWest: GeoPoint(latitude: 34.0, longitude: 138.0),
+            northEast: GeoPoint(latitude: 36.0, longitude: 140.0)
+        ))
+    )
+
+    private func markers() -> [MarkerState] {
+        [
+            MarkerState(position: GeoPoint(latitude: 35.0, longitude: 139.0), id: "m1"),
+            MarkerState(position: GeoPoint(latitude: 35.1, longitude: 139.1), id: "m2"),
+        ]
+    }
+
+    /// GL 系の描画担当: onRemove では地図に触らず、onPostProcess で manager の全部を描き直す。
+    @MainActor
+    private final class GlRenderer: MarkerOverlayRendererProtocol {
+        typealias ActualMarker = String
+        let manager: MarkerManager<String>
+        var drawn: [String] = []
+        var removed: [String] = []
+        var animateStartListener: OnMarkerEventHandler?
+        var animateEndListener: OnMarkerEventHandler?
+        init(_ manager: MarkerManager<String>) { self.manager = manager }
+        func onAdd(data: [MarkerOverlayAddParams]) async -> [String?] { data.map { $0.state.id } }
+        func onChange(data: [MarkerOverlayChangeParams<String>]) async -> [String?] { data.map { $0.current.state.id } }
+        func onRemove(data: [MarkerEntity<String>]) async { removed += data.map { $0.state.id } }
+        func onAnimate(entity: MarkerEntity<String>) async {}
+        func onPostProcess() async { drawn = manager.allEntities().map { $0.state.id }.sorted() }
+    }
+
+    /// 渡されたマーカーを全部描くストラテジ。描いた状態は manager へ直接登録する。
+    private final class DrawAllStrategy: MarkerRenderingStrategyProtocol {
+        typealias ActualMarker = String
+        let markerManager = MarkerManager<String>()
+        var cleared = 0
+
+        func clear() {
+            cleared += 1
+            markerManager.clear()
+        }
+
+        func onAdd<Renderer: MarkerOverlayRendererProtocol>(
+            data: [MarkerState],
+            viewport _: GeoRectBounds,
+            renderer: Renderer
+        ) async -> Bool where Renderer.ActualMarker == String {
+            for state in data {
+                markerManager.registerEntity(MarkerEntity(marker: state.id, state: state, isRendered: true))
+            }
+            await renderer.onPostProcess()
+            return true
+        }
+
+        func onUpdate<Renderer: MarkerOverlayRendererProtocol>(
+            state _: MarkerState,
+            viewport _: GeoRectBounds,
+            renderer _: Renderer
+        ) async -> Bool where Renderer.ActualMarker == String { true }
+
+        func onCameraChanged<Renderer: MarkerOverlayRendererProtocol>(
+            mapCameraPosition _: MapCameraPosition,
+            renderer _: Renderer
+        ) async where Renderer.ActualMarker == String {}
+    }
+
+    @MainActor
+    func testClearLeavesNothingDrawnAndKeepsTheStrategyReset() async {
+        let strategy = DrawAllStrategy()
+        let renderer = GlRenderer(strategy.markerManager)
+        let controller = StrategyMarkerController(strategy: strategy, renderer: renderer)
+        await controller.onCameraChanged(mapCameraPosition: camera)
+        await controller.add(data: markers())
+        XCTAssertEqual(renderer.drawn, ["m1", "m2"])
+
+        await controller.clear()
+
+        XCTAssertEqual(renderer.removed.sorted(), ["m1", "m2"])
+        XCTAssertEqual(strategy.cleared, 1)
+        XCTAssertEqual(renderer.drawn, [])
+    }
+
+    @MainActor
+    func testClearDropsMarkersWaitingForTheFirstCamera() async {
+        let strategy = DrawAllStrategy()
+        let renderer = GlRenderer(strategy.markerManager)
+        let controller = StrategyMarkerController(strategy: strategy, renderer: renderer)
+        await controller.add(data: markers()) // カメラ前なので保留
+        await controller.clear()
+        await controller.onCameraChanged(mapCameraPosition: camera)
+        XCTAssertEqual(renderer.drawn, [])
+    }
+
+    @MainActor
+    func testMarkersSentAgainAfterClearAreDrawnAgain() async {
+        let strategy = DrawAllStrategy()
+        let renderer = GlRenderer(strategy.markerManager)
+        let controller = StrategyMarkerController(strategy: strategy, renderer: renderer)
+        await controller.onCameraChanged(mapCameraPosition: camera)
+        await controller.add(data: markers())
+        await controller.clear()
+        await controller.add(data: markers())
+        XCTAssertEqual(renderer.drawn, ["m1", "m2"])
+    }
+}