diff --git a/Deck.gd b/Deck.gd
index be124e2..e41bd55 100644
--- a/Deck.gd
+++ b/Deck.gd
@@ -65,6 +65,7 @@ onready var cards = [
 ]
 
 var card_order = []
+var next_to_draw = 0
 
 # Called when the node enters the scene tree for the first time.
 func _ready() -> void:
@@ -83,3 +84,16 @@ func init_card_order() -> void:
 	for i in range(cards.size()):
 		card_order[i] = i
 	card_order.shuffle()
+	next_to_draw = 0
+
+func draw_card() -> int:
+	if next_to_draw >= card_order.size():
+		return -1
+	var card_id = card_order[next_to_draw]
+	next_to_draw += 1
+	return card_id
+
+func card(index: int) -> HanafudaCard:
+	if index == -1:
+		printerr("Invalid card index")
+	return cards[index]
diff --git a/HanafudaCard.gd b/HanafudaCard.gd
index c58893b..aab743a 100644
--- a/HanafudaCard.gd
+++ b/HanafudaCard.gd
@@ -54,10 +54,8 @@ func reveal(new_reveal: bool) -> void:
 		yield(self, "ready")
 
 	if revealed:
-		print("Reveal card")
 		$Frontside.show()
 		$Backside.hide()
 	else:
-		print("Conceal card")
 		$Frontside.hide()
 		$Backside.show()
diff --git a/Main.gd b/Main.gd
index fae3ad7..0a2154e 100644
--- a/Main.gd
+++ b/Main.gd
@@ -1,34 +1,54 @@
 extends Node
 
+signal state_completed
 
 var state_stack = []
 
+onready var deck = $Deck
+onready var tween = $Tween
+
 func _ready():
 	state_stack.push_back(funcref(self, "update_game"))
 	state_stack.push_back(funcref(self, "update_oya"))
 	
 func _process(delta):
+#	print("Main::_process()")
 	if state_stack.empty():
 		return
 
 	var state = state_stack.pop_back()
+#	print(state)
 	if state == null:
 		return
-		
-	if state is FuncRef:
-		state_stack.push_back(state.call_func())
-		return
-		
-	if not (state is GDScriptFunctionState and state.is_valid()):
-		printerr("Invalid state")
-		return
-
-	state_stack.push_back(state.resume())
+	
+	state.call_func()
+	yield(self, "state_completed")
+#	state_stack.pop_back()
 
 func update_oya():
-	yield()
+	var card_1 = $Deck.card($Deck.draw_card())
+	card_1.show()
+
+	tween.start()
+
+	tween.interpolate_property(card_1, "position",
+		Vector2(0, 0), Vector2(100, 100), 3,
+		Tween.TRANS_LINEAR, Tween.EASE_IN_OUT)
+
+	yield(tween, "tween_all_completed")
+	yield(tween, "tween_completed")
+
+#	var card_2 = $Deck.card($Deck.draw_card())
+#	card_2.show()
+#	tween.interpolate_property(card_2, "position",
+#		Vector2(0, 0), Vector2(-100, 100), 0.4,
+#		Tween.TRANS_LINEAR, Tween.EASE_IN_OUT)
+#
+#	yield(tween, "tween_all_completed")
+	
 	print("update oya")
-	yield()
+	emit_signal("state_completed")
 
 func update_game():
 	print("update game")
+	emit_signal("state_completed")
diff --git a/Main.tscn b/Main.tscn
index 9687049..10393bf 100644
--- a/Main.tscn
+++ b/Main.tscn
@@ -23,3 +23,5 @@ month = 2
 [node name="Deck" type="Node2D" parent="."]
 position = Vector2( 293, 412 )
 script = ExtResource( 3 )
+
+[node name="Tween" type="Tween" parent="."]