diff --git a/src/layer/domain/router/module/fetch.ts b/src/layer/domain/router/module/fetch.ts
index 95f1f36b..24f4e090 100644
--- a/src/layer/domain/router/module/fetch.ts
+++ b/src/layer/domain/router/module/fetch.ts
@@ -34,6 +34,7 @@ export async function fetch(
       config.fetch.timeout,
       state.process,
       config.fetch.rewrite,
+      // 遷移成功後に遷移可能性が自然に壊れることはないため検査不要
       memory),
     wait(config.fetch.wait),
     window.dispatchEvent(new Event('pjax:fetch')),
diff --git a/src/layer/domain/router/module/update.ts b/src/layer/domain/router/module/update.ts
index a769f602..6b5ba389 100644
--- a/src/layer/domain/router/module/update.ts
+++ b/src/layer/domain/router/module/update.ts
@@ -57,9 +57,7 @@ export function update(
           event.location.dest.href,
           documents.src,
           area,
-          memory && separate({ src: memory, dst: documents.dst }, [area]).extract(() => false)
-            ? memory
-            : undefined);
+          memory);
         return seqB;
       })
       .bind(seqB =>