diff --git a/sjplayer/src/sjplayer/Context.d b/sjplayer/src/sjplayer/Context.d
new file mode 100644
index 0000000..7e4620f
--- /dev/null
+++ b/sjplayer/src/sjplayer/Context.d
@@ -0,0 +1,42 @@
+/// License: MIT
+module sjplayer.Context;
+
+import std.algorithm;
+
+import sjplayer.ElementInterface,
+       sjplayer.ScheduledControllerInterface;
+
+///
+struct Context {
+ public:
+  @disable this();
+  @disable this(this);
+
+  ///
+  ~this() {
+    controllers_.each!destroy;
+    drawers_.each!destroy;
+    elements_.each!destroy;
+  }
+
+  ///
+  ElementInterface.DamageCalculationResult CalculateDamage() const {
+    assert(false);  // TODO:
+  }
+
+  ///
+  void DrawElements() {
+    drawers_.each!(x => x.Draw());
+  }
+  ///
+  void OperateScheduledControllers(float time) {
+    controllers_.each!(x => x.Operate(time));
+  }
+
+ private:
+  ElementInterface[] elements_;
+
+  ElementDrawerInterface[] drawers_;
+
+  ScheduledControllerInterface[] controllers_;
+}
diff --git a/sjplayer/src/sjplayer/package.d b/sjplayer/src/sjplayer/package.d
index 3264cb2..5a2cbf1 100644
--- a/sjplayer/src/sjplayer/package.d
+++ b/sjplayer/src/sjplayer/package.d
@@ -4,15 +4,16 @@ module sjplayer;
 import sjscript;
 
 public {
-  import sjplayer.ElementProgramSet;
+  import sjplayer.Context,
+         sjplayer.ElementProgramSet;
 }
 
 ///
-auto CreateContextFromText(string src, ElementProgramSet programs) {
+Context CreateContextFromText(string src, ElementProgramSet programs) {
   return src.CreateScriptAst().CreateContextFromScriptAst(programs);
 }
 ///
-auto CreateContextFromScriptAst(
+Context CreateContextFromScriptAst(
     ParametersBlock[] params, ElementProgramSet programs) {
   // TODO:
   assert(false);