diff --git a/sdga/authv1.py b/sdga/authv1.py
new file mode 100644
index 0000000..87e6d9b
--- /dev/null
+++ b/sdga/authv1.py
@@ -0,0 +1,40 @@
+import base64
+import urllib3
+import zlib
+import re
+
+def DownloadOrder():
+    ua = 'Windows/3.0'
+    content = b'title_id=SDGA&title_ver=1.50&serial=A63E01E0048&encode=UTF-8'
+    body = base64.b64encode(zlib.compress(content))
+    http = urllib3.PoolManager()
+    r = http.request(
+        'POST',
+        'https://naominet.jp/sys/servlet/DownloadOrder',
+        body = body,
+        headers = {
+            'Pragma': 'DFI',
+            'User-Agent': ua,
+            'Content-Type': 'application/x-www-form-urlencoded',
+        }
+    )
+    resp_data = r.data
+    response = zlib.decompress(base64.b64decode(resp_data))
+    return response
+
+def uri():
+    data = DownloadOrder()
+    endpoint = re.findall("https://[^&s]+", data)[0]
+    http = urllib3.PoolManager()
+    r = http.request(
+        'GET',
+        endpoint,
+        headers = {
+            'User-Agent': 'A63E01E0000',
+        }
+    )
+    response = r.data
+    return response
+
+if __name__ == "__main__":
+    print(uri())