diff --git a/userscript/manga-bookmark.user.js b/userscript/manga-bookmark.user.js
index 9f9b4a1..f8ef6ba 100644
--- a/userscript/manga-bookmark.user.js
+++ b/userscript/manga-bookmark.user.js
@@ -311,9 +311,11 @@
   }
 
   // Highest chapter the site lists, or null when the markup yields nothing.
-  function computeLatestChapter(site, anchors) {
+  // seriesId is only consulted by adapters whose pages carry other series'
+  // chapter links; the rest ignore it.
+  function computeLatestChapter(site, anchors, seriesId) {
     const a = adapterFor(site);
-    return a ? a.latestChapterFromAnchors(anchors) : null;
+    return a ? a.latestChapterFromAnchors(anchors, seriesId) : null;
   }
 
   function currentSite() {
@@ -834,7 +836,7 @@
     if (!existing) return;
     applyLatestChapterIfChanged(
       existing,
-      computeLatestChapter(p.site, anchorsFromDocument(document))
+      computeLatestChapter(p.site, anchorsFromDocument(document), p.seriesId)
     );
   }
 
@@ -864,7 +866,7 @@
         const res = await fetch(bm.series_url, { credentials: "same-origin" });
         if (!res.ok) continue;
         const html = await res.text();
-        const latest = computeLatestChapter(bm.site, anchorsFromHTML(html));
+        const latest = computeLatestChapter(bm.site, anchorsFromHTML(html), bm.series_id);
         await applyLatestChapterIfChanged(state.byKey[bm.key] || bm, latest);
       } catch (e) {
         /* offline or blocked — try again after the throttle window */
diff --git a/userscript/test/logic.test.js b/userscript/test/logic.test.js
index 2271956..7ed1677 100644
--- a/userscript/test/logic.test.js
+++ b/userscript/test/logic.test.js
@@ -264,6 +264,16 @@ test("comix latest returns null when no chapter links are present", () => {
   assert.equal(comix.latestChapterFromAnchors(anchorsFromHTML("<a href='/browse'>x</a>"), "n8we"), null);
 });
 
+test("asura and demonic ignore the seriesId argument", () => {
+  const asuraAnchors = anchorsFromHTML(
+    `<a href="/comics/x-aabbccdd/chapter/12"><span>Chapter 12</span></a>`
+  );
+  assert.deepEqual(asura.latestChapterFromAnchors(asuraAnchors, "ignored"), {
+    num: 12,
+    label: "Chapter 12",
+  });
+});
+
 // ============================================================
 // Shared helpers
 // ============================================================