private: System::Void Form1_Load(System::Object^ sender, System::EventArgs^ e) {
        unsigned char u_a[] = "わーるど";
      //  TCHAR w_a[] = L"わーるど";
        wchar_t w_a[] = L"わーるど";
        String^ s_a = gcnew String(w_a);

        label1->Text = u_a;
        label1->Text = gcnew String(w_a);
       }

答えになってるかどうか分からないけど、参考まで。