diff --git a/changes/fix-windows-secondary-hover-titlebar.md b/changes/fix-windows-secondary-hover-titlebar.md
new file mode 100644
index 00000000..94890fba
--- /dev/null
+++ b/changes/fix-windows-secondary-hover-titlebar.md
@@ -0,0 +1,4 @@
+type: fixed
+area: overlay
+
+- Fixed Windows secondary subtitle hover mode so the expanded hover hit area no longer blocks the native minimize, maximize, and close buttons.
diff --git a/src/renderer/error-recovery.test.ts b/src/renderer/error-recovery.test.ts
index eea72bdf..dabd10e0 100644
--- a/src/renderer/error-recovery.test.ts
+++ b/src/renderer/error-recovery.test.ts
@@ -230,6 +230,42 @@ test('resolvePlatformInfo supports modal layer and disables mouse-ignore toggles
   }
 });
 
+test('resolvePlatformInfo flags Windows platforms', () => {
+  const previousWindow = (globalThis as { window?: unknown }).window;
+  const previousNavigator = (globalThis as { navigator?: unknown }).navigator;
+
+  Object.defineProperty(globalThis, 'window', {
+    configurable: true,
+    value: {
+      electronAPI: {
+        getOverlayLayer: () => 'visible',
+      },
+      location: { search: '' },
+    },
+  });
+  Object.defineProperty(globalThis, 'navigator', {
+    configurable: true,
+    value: {
+      platform: 'Win32',
+      userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)',
+    },
+  });
+
+  try {
+    const info = resolvePlatformInfo();
+    assert.equal(info.isWindowsPlatform, true);
+    assert.equal(info.isMacOSPlatform, false);
+    assert.equal(info.isLinuxPlatform, false);
+    assert.equal(info.shouldToggleMouseIgnore, true);
+  } finally {
+    Object.defineProperty(globalThis, 'window', { configurable: true, value: previousWindow });
+    Object.defineProperty(globalThis, 'navigator', {
+      configurable: true,
+      value: previousNavigator,
+    });
+  }
+});
+
 test('isYomitanPopupIframe matches modern popup class and legacy id prefix', () => {
   const createElement = (options: {
     tagName: string;
diff --git a/src/renderer/renderer.ts b/src/renderer/renderer.ts
index df4744a4..df3d363c 100644
--- a/src/renderer/renderer.ts
+++ b/src/renderer/renderer.ts
@@ -529,6 +529,9 @@ async function init(): Promise<void> {
   if (ctx.platform.isMacOSPlatform) {
     document.body.classList.add('platform-macos');
   }
+  if (ctx.platform.isWindowsPlatform) {
+    document.body.classList.add('platform-windows');
+  }
   if (ctx.platform.shouldToggleMouseIgnore) {
     syncOverlayMouseIgnoreState(ctx);
   }
diff --git a/src/renderer/style.css b/src/renderer/style.css
index 53c4ce7d..641c2e7e 100644
--- a/src/renderer/style.css
+++ b/src/renderer/style.css
@@ -1131,6 +1131,11 @@ body.subtitle-sidebar-embedded-open #secondarySubContainer.secondary-sub-hover {
   justify-content: center;
 }
 
+body.platform-windows #secondarySubContainer.secondary-sub-hover {
+  top: 40px;
+  padding-top: 0;
+}
+
 #secondarySubContainer.secondary-sub-hover #secondarySubRoot {
   background: transparent;
   backdrop-filter: none;
diff --git a/src/renderer/subtitle-render.test.ts b/src/renderer/subtitle-render.test.ts
index ef80f024..04fc6262 100644
--- a/src/renderer/subtitle-render.test.ts
+++ b/src/renderer/subtitle-render.test.ts
@@ -989,6 +989,13 @@ test('JLPT CSS rules use underline-only styling in renderer stylesheet', () => {
     /transform:\s*translateX\(calc\(var\(--subtitle-sidebar-reserved-width\)\s*\*\s*-0\.5\)\);/,
   );
 
+  const secondaryHoverWindowsBlock = extractClassBlock(
+    cssText,
+    'body.platform-windows #secondarySubContainer.secondary-sub-hover',
+  );
+  assert.match(secondaryHoverWindowsBlock, /top:\s*40px;/);
+  assert.match(secondaryHoverWindowsBlock, /padding-top:\s*0;/);
+
   const subtitleSidebarListBlock = extractClassBlock(cssText, '.subtitle-sidebar-list');
   assert.doesNotMatch(subtitleSidebarListBlock, /scroll-behavior:\s*smooth;/);
 
diff --git a/src/renderer/utils/platform.ts b/src/renderer/utils/platform.ts
index 7134c038..0169ed17 100644
--- a/src/renderer/utils/platform.ts
+++ b/src/renderer/utils/platform.ts
@@ -5,6 +5,7 @@ export type PlatformInfo = {
   isModalLayer: boolean;
   isLinuxPlatform: boolean;
   isMacOSPlatform: boolean;
+  isWindowsPlatform: boolean;
   shouldToggleMouseIgnore: boolean;
 };
 
@@ -24,12 +25,15 @@ export function resolvePlatformInfo(): PlatformInfo {
   const isLinuxPlatform = navigator.platform.toLowerCase().includes('linux');
   const isMacOSPlatform =
     navigator.platform.toLowerCase().includes('mac') || /mac/i.test(navigator.userAgent);
+  const isWindowsPlatform =
+    navigator.platform.toLowerCase().includes('win') || /windows/i.test(navigator.userAgent);
 
   return {
     overlayLayer,
     isModalLayer,
     isLinuxPlatform,
     isMacOSPlatform,
+    isWindowsPlatform,
     shouldToggleMouseIgnore: !isLinuxPlatform && !isModalLayer,
   };
 }