diff --git a/public/raid/imutil.hpp b/public/raid/imutil.hpp
index 6ec5935..10bb744 100644
--- a/public/raid/imutil.hpp
+++ b/public/raid/imutil.hpp
@@ -20,9 +20,6 @@ namespace raid
 
 namespace impl
 {
-template<std::size_t I>
-inline std::string gFormatBuffer;
-
 struct FormatBuffer
 {
     std::string data;
@@ -121,6 +118,13 @@ public:
         MIJIN_ASSERT(mBufferIdx != kInvalidIdx, "invalid temp text");
         return impl::gFormatBuffers[mBufferIdx].data.c_str();
     }
+
+    [[nodiscard]]
+    const char* end() const noexcept
+    {
+        MIJIN_ASSERT(mBufferIdx != kInvalidIdx, "invalid temp text");
+        return impl::gFormatBuffers[mBufferIdx].data.c_str() + static_cast<std::ptrdiff_t>(impl::gFormatBuffers[mBufferIdx].data.size());
+    }
 private:
     void release()
     {
@@ -218,7 +222,7 @@ const char* formatTemp(std::string& formatBuffer, std::format_string<TArgs...> f
     return formatBuffer.c_str();
 }
 
-template<std::size_t I = 0, typename... TArgs>
+template<typename... TArgs>
 [[nodiscard]]
 TempText formatTemp(std::format_string<TArgs...> fmt, TArgs&&... args)
 {