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diff --git a/runtime/onert/api/src/nnfw_api_internal.h b/runtime/onert/api/src/nnfw_api_internal.h
new file mode 100644
index 000000000..7fe4e0a26
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+++ b/runtime/onert/api/src/nnfw_api_internal.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __API_NNFW_API_INTERNAL_H__
+#define __API_NNFW_API_INTERNAL_H__
+
+#include "nnfw.h"
+#include "nnfw_dev.h"
+
+#include <util/GeneralConfigSource.h>
+
+#include <string>
+#include <memory>
+
+namespace onert
+{
+namespace frontend
+{
+namespace custom
+{
+class KernelRegistry;
+}
+} // namespace frontend
+namespace exec
+{
+class Execution;
+} // namespace exec
+namespace ir
+{
+class Graph;
+} // namespace ir
+namespace compiler
+{
+class Compiler;
+} // namespace compiler
+} // namespace onert
+
+struct nnfw_session
+{
+public:
+  nnfw_session();
+  ~nnfw_session();
+
+  NNFW_STATUS load_model_from_file(const char *package_file_path);
+  NNFW_STATUS prepare();
+  NNFW_STATUS run();
+
+  NNFW_STATUS set_input(uint32_t index, NNFW_TYPE type, const void *buffer, size_t length);
+  NNFW_STATUS set_output(uint32_t index, NNFW_TYPE type, void *buffer, size_t length);
+
+  NNFW_STATUS input_size(uint32_t *number);
+  NNFW_STATUS output_size(uint32_t *number);
+
+  NNFW_STATUS set_input_layout(uint32_t index, NNFW_LAYOUT layout);
+  NNFW_STATUS set_output_layout(uint32_t index, NNFW_LAYOUT layout);
+
+  NNFW_STATUS apply_tensorinfo(uint32_t index, nnfw_tensorinfo ti);
+
+  NNFW_STATUS input_tensorinfo(uint32_t index, nnfw_tensorinfo *ti);
+  NNFW_STATUS output_tensorinfo(uint32_t index, nnfw_tensorinfo *ti);
+
+  NNFW_STATUS register_custom_operation(const std::string &id, nnfw_custom_eval eval_func);
+
+  NNFW_STATUS set_available_backends(const char *backends);
+  NNFW_STATUS set_op_backend(const char *op, const char *backend);
+
+  NNFW_STATUS set_config(const char *key, const char *value);
+
+private:
+  std::shared_ptr<onert::ir::Graph> _primary_subgraph;
+  std::unique_ptr<onert::compiler::Compiler> _compiler;
+  std::shared_ptr<onert::exec::Execution> _execution;
+  std::shared_ptr<onert::frontend::custom::KernelRegistry> _kernel_registry;
+
+protected:
+  std::unique_ptr<onert::util::GeneralConfigSource> _source;
+};
+
+#endif // __API_NNFW_API_INTERNAL_H__