diff --git a/CMakeLists.txt b/CMakeLists.txt
index 49420b37..41216371 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -105,6 +105,7 @@ add_executable(newserv
     src/StaticGameData.cc
     src/Text.cc
     src/TextArchive.cc
+    src/UnicodeTextSet.cc
     src/Version.cc
     src/WordSelectTable.cc
 )
diff --git a/src/Main.cc b/src/Main.cc
index a63e0cdf..75132e5b 100644
--- a/src/Main.cc
+++ b/src/Main.cc
@@ -37,6 +37,7 @@
 #include "StaticGameData.hh"
 #include "Text.hh"
 #include "TextArchive.hh"
+#include "UnicodeTextSet.hh"
 
 using namespace std;
 
@@ -317,6 +318,8 @@ enum class Behavior {
   EXTRACT_BML,
   DECODE_TEXT_ARCHIVE,
   ENCODE_TEXT_ARCHIVE,
+  DECODE_UNICODE_TEXT_SET,
+  ENCODE_UNICODE_TEXT_SET,
   FORMAT_RARE_ITEM_SET,
   CONVERT_ITEMRT_REL_TO_JSON,
   CONVERT_ITEMRT_GSL_TO_JSON,
@@ -375,6 +378,8 @@ static bool behavior_takes_input_filename(Behavior b) {
       (b == Behavior::EXTRACT_BML) ||
       (b == Behavior::DECODE_TEXT_ARCHIVE) ||
       (b == Behavior::ENCODE_TEXT_ARCHIVE) ||
+      (b == Behavior::DECODE_UNICODE_TEXT_SET) ||
+      (b == Behavior::ENCODE_UNICODE_TEXT_SET) ||
       (b == Behavior::DESCRIBE_ITEM) ||
       (b == Behavior::ENCODE_ITEM) ||
       (b == Behavior::PARSE_OBJECT_GRAPH) ||
@@ -415,7 +420,9 @@ static bool behavior_takes_output_filename(Behavior b) {
       (b == Behavior::EXTRACT_GSL) ||
       (b == Behavior::EXTRACT_BML) ||
       (b == Behavior::DECODE_TEXT_ARCHIVE) ||
-      (b == Behavior::ENCODE_TEXT_ARCHIVE);
+      (b == Behavior::ENCODE_TEXT_ARCHIVE) ||
+      (b == Behavior::DECODE_UNICODE_TEXT_SET) ||
+      (b == Behavior::ENCODE_UNICODE_TEXT_SET);
 }
 
 int main(int argc, char** argv) {
@@ -656,6 +663,10 @@ int main(int argc, char** argv) {
           behavior = Behavior::DECODE_TEXT_ARCHIVE;
         } else if (!strcmp(argv[x], "encode-text-archive")) {
           behavior = Behavior::ENCODE_TEXT_ARCHIVE;
+        } else if (!strcmp(argv[x], "decode-unicode-text-set")) {
+          behavior = Behavior::DECODE_UNICODE_TEXT_SET;
+        } else if (!strcmp(argv[x], "encode-unicode-text-set")) {
+          behavior = Behavior::ENCODE_UNICODE_TEXT_SET;
         } else if (!strcmp(argv[x], "generate-dc-serial-number")) {
           behavior = Behavior::GENERATE_DC_SERIAL_NUMBER;
         } else if (!strcmp(argv[x], "generate-all-dc-serial-numbers")) {
@@ -735,7 +746,7 @@ int main(int argc, char** argv) {
         filename += ".bmp";
       } else if (behavior == Behavior::ENCODE_GVM) {
         filename += ".gvm";
-      } else if (behavior == Behavior::DECODE_TEXT_ARCHIVE) {
+      } else if ((behavior == Behavior::DECODE_TEXT_ARCHIVE) || (behavior == Behavior::DECODE_UNICODE_TEXT_SET)) {
         filename += ".json";
       } else if (behavior == Behavior::DISASSEMBLE_QUEST_SCRIPT) {
         filename += ".txt";
@@ -1502,6 +1513,26 @@ int main(int argc, char** argv) {
       }
       break;
     }
+    case Behavior::DECODE_UNICODE_TEXT_SET: {
+      auto strings = parse_unicode_text_set(read_input_data());
+      JSON j = JSON::list();
+      for (const u16string& s : strings) {
+        j.emplace_back(encode_sjis(s));
+      }
+      string out_data = j.serialize(JSON::SerializeOption::FORMAT);
+      write_output_data(out_data.data(), out_data.size());
+      break;
+    }
+    case Behavior::ENCODE_UNICODE_TEXT_SET: {
+      auto json = JSON::parse(read_input_data());
+      vector<u16string> strings;
+      for (const auto& s_json : json.as_list()) {
+        strings.emplace_back(decode_sjis(s_json->as_string()));
+      }
+      string encoded = serialize_unicode_text_set(strings);
+      write_output_data(encoded.data(), encoded.size());
+      break;
+    }
 
     case Behavior::CAT_CLIENT: {
       shared_ptr<PSOBBEncryption::KeyFile> key;
diff --git a/src/UnicodeTextSet.cc b/src/UnicodeTextSet.cc
new file mode 100644
index 00000000..f45dfc85
--- /dev/null
+++ b/src/UnicodeTextSet.cc
@@ -0,0 +1,40 @@
+#include "UnicodeTextSet.hh"
+
+#include <phosg/Strings.hh>
+#include <string>
+#include <vector>
+
+#include "Compression.hh"
+
+using namespace std;
+
+vector<u16string> parse_unicode_text_set(const string& prs_data) {
+  string data = prs_decompress(prs_data);
+  StringReader r(data);
+  r.skip(4);
+  uint32_t count = r.get_u32l();
+
+  vector<u16string> ret;
+  while (ret.size() < count) {
+    ret.emplace_back(&r.pget<char16_t>(r.get_u32l()));
+  }
+  return ret;
+}
+
+string serialize_unicode_text_set(const vector<u16string>& strings) {
+  StringWriter w;
+  w.put_u32l(strings.size());
+  size_t string_offset = (strings.size() * 4) + 4; // Header size
+  for (const auto& s : strings) {
+    w.put_u32l(string_offset);
+    string_offset = (((s.size() + 1) << 1) + 3) & (~3);
+  }
+  for (const auto& s : strings) {
+    u16string uni_s = decode_sjis(s);
+    w.write(uni_s.c_str(), (uni_s.size() + 1) * 2);
+    while (w.size() & 3) {
+      w.put_u8(0);
+    }
+  }
+  return std::move(w.str());
+}
diff --git a/src/UnicodeTextSet.hh b/src/UnicodeTextSet.hh
new file mode 100644
index 00000000..ef03ba6c
--- /dev/null
+++ b/src/UnicodeTextSet.hh
@@ -0,0 +1,7 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+std::vector<std::u16string> parse_unicode_text_set(const std::string& prs_data);
+std::string serialize_unicode_text_set(const std::vector<std::u16string>& strings);