diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4d9bb67..8d62e1f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -49,6 +49,10 @@ if(WIN32)
     include/kabufuda/winsupport.hpp
     lib/kabufuda/AsyncIOWin32.cpp
   )
+elseif(NX)
+  target_sources(kabufuda PRIVATE
+    lib/kabufuda/AsyncIONX.cpp
+  )
 else()
   target_sources(kabufuda PRIVATE
     lib/kabufuda/AsyncIOPosix.cpp
diff --git a/include/kabufuda/AsyncIO.hpp b/include/kabufuda/AsyncIO.hpp
index 63f1091..51af61d 100644
--- a/include/kabufuda/AsyncIO.hpp
+++ b/include/kabufuda/AsyncIO.hpp
@@ -1,8 +1,13 @@
 #pragma once
 
 #ifndef _WIN32
+#ifdef __SWITCH__
+#include <sys/types.h>
+using SizeReturn = ssize_t;
+#else
 #include <aio.h>
 using SizeReturn = ssize_t;
+#endif
 #else
 #include <windows.h>
 using SizeReturn = DWORD;
@@ -16,7 +21,9 @@ using SizeReturn = DWORD;
 namespace kabufuda {
 
 class AsyncIO {
-#ifndef _WIN32
+#ifdef __SWITCH__
+  FILE* m_fd;
+#elif !defined(_WIN32)
   int m_fd = -1;
   std::vector<std::pair<struct aiocb, SizeReturn>> m_queue;
 #else
@@ -34,13 +41,19 @@ public:
   AsyncIO& operator=(AsyncIO&& other);
   AsyncIO(const AsyncIO* other) = delete;
   AsyncIO& operator=(const AsyncIO& other) = delete;
-  void resizeQueue(size_t queueSz) { m_queue.resize(queueSz); }
+  void resizeQueue(size_t queueSz) {
+#ifndef __SWITCH__
+    m_queue.resize(queueSz);
+#endif
+  }
   bool asyncRead(size_t qIdx, void* buf, size_t length, off_t offset);
   bool asyncWrite(size_t qIdx, const void* buf, size_t length, off_t offset);
   ECardResult pollStatus(size_t qIdx, SizeReturn* szRet = nullptr) const;
   ECardResult pollStatus() const;
   void waitForCompletion() const;
-#ifndef _WIN32
+#ifdef __SWITCH__
+  explicit operator bool() const { return m_fd != nullptr; }
+#elif !defined(_WIN32)
   explicit operator bool() const { return m_fd != -1; }
 #else
   explicit operator bool() const { return m_fh != INVALID_HANDLE_VALUE; }
diff --git a/lib/kabufuda/AsyncIONX.cpp b/lib/kabufuda/AsyncIONX.cpp
new file mode 100644
index 0000000..2ec06c3
--- /dev/null
+++ b/lib/kabufuda/AsyncIONX.cpp
@@ -0,0 +1,48 @@
+#include "kabufuda/AsyncIO.hpp"
+
+#include <cstdio>
+#include <cstring>
+
+namespace kabufuda {
+
+AsyncIO::AsyncIO(SystemStringView filename, bool truncate) { m_fd = fopen(filename.data(), truncate ? "rw" : "ra"); }
+
+AsyncIO::~AsyncIO() {
+  if (*this) {
+    fclose(m_fd);
+  }
+}
+
+AsyncIO::AsyncIO(AsyncIO&& other) {
+  m_fd = other.m_fd;
+  other.m_fd = nullptr;
+  m_maxBlock = other.m_maxBlock;
+}
+
+AsyncIO& AsyncIO::operator=(AsyncIO&& other) {
+  if (*this) {
+    fclose(m_fd);
+  }
+  m_fd = other.m_fd;
+  other.m_fd = nullptr;
+  m_maxBlock = other.m_maxBlock;
+  return *this;
+}
+
+void AsyncIO::_waitForOperation(size_t qIdx) const {}
+
+bool AsyncIO::asyncRead(size_t qIdx, void* buf, size_t length, off_t offset) {
+  return fread(buf, length, offset, m_fd);
+}
+
+bool AsyncIO::asyncWrite(size_t qIdx, const void* buf, size_t length, off_t offset) {
+  return fwrite(buf, length, offset, m_fd);
+}
+
+ECardResult AsyncIO::pollStatus(size_t qIdx, SizeReturn* szRet) const { return ECardResult::READY; }
+
+ECardResult AsyncIO::pollStatus() const { return ECardResult::READY; }
+
+void AsyncIO::waitForCompletion() const {}
+
+} // namespace kabufuda