diff --git a/lang/src/llvm_ir/instructions/phi.hako b/lang/src/llvm_ir/instructions/phi.hako
index d809b0f7..54d8c51b 100644
--- a/lang/src/llvm_ir/instructions/phi.hako
+++ b/lang/src/llvm_ir/instructions/phi.hako
@@ -19,7 +19,7 @@ static box LLVMPhiInstructionBox {
   // Returns:
   //   JSON文字列: {"op":"phi","dst":5,"incoming":[...]}
   //
-  lower_phi(dst, incoming_list) {
+  lower_phi(self, dst, incoming_list) {
     // 空チェック: incoming が空の場合は 0 定数を返す
     // Python: phi.py 34-37行の動作と同じ
     if incoming_list == null {
@@ -41,7 +41,7 @@ static box LLVMPhiInstructionBox {
 
   // 空のPHI: 0定数にフォールバック
   // Python: phi.py 34-37行
-  _phi_empty_fallback(dst) {
+  _phi_empty_fallback(self, dst) {
     // No incoming edges - use zero constant
     return "{\"op\":\"const\",\"dst\":" + dst + ",\"value\":{\"type\":\"i64\",\"value\":0}}"
   }
@@ -54,7 +54,7 @@ static box LLVMPhiInstructionBox {
   // Returns:
   //   JSON配列文字列: [{"value":1,"block":1},{"value":2,"block":2}]
   //
-  _build_incoming_array(incoming_list) {
+  _build_incoming_array(self, incoming_list) {
     local result = "["
     local first = 1
 
@@ -86,8 +86,8 @@ static box LLVMPhiInstructionBox {
   }
 
   // デバッグ用 - 生成された命令の確認
-  debug_phi(dst, incoming_list) {
-    local json = me.lower_phi(dst, incoming_list)
+  debug_phi(self, dst, incoming_list) {
+    local json = me.lower_phi(self, dst, incoming_list)
     print("Generated PHI instruction: " + json)
     return json
   }
@@ -95,33 +95,33 @@ static box LLVMPhiInstructionBox {
   // Stage 2 プレースホルダー: Block End Values管理（将来実装）
   // Python: phi.py 69-79行の block_end_values スナップショット処理
   // 注: Hakorune版では不要（C++バックエンドが処理）
-  lower_phi_with_snapshot(dst, incoming_list, block_end_values) {
+  lower_phi_with_snapshot(self, dst, incoming_list, block_end_values) {
     // 現時点では基本版と同じ動作
-    return me.lower_phi(dst, incoming_list)
+    return me.lower_phi(self, incoming_list)
   }
 
   // Stage 3 プレースホルダー: 型変換処理（将来実装）
   // Python: phi.py 84-103行の型変換処理
   // 注: Hakorune版では不要（C++バックエンドが処理）
-  lower_phi_with_type_info(dst, incoming_list, type_info) {
+  lower_phi_with_type_info(self, dst, incoming_list, type_info) {
     // 現時点では基本版と同じ動作
-    return me.lower_phi(dst, incoming_list)
+    return me.lower_phi(self, incoming_list)
   }
 
   // Stage 4 プレースホルダー: Strict Mode（将来実装）
   // Python: phi.py 118-121行の NYASH_LLVM_PHI_STRICT チェック
   // 注: C++バックエンドで実装予定
-  lower_phi_strict(dst, incoming_list, strict_mode) {
+  lower_phi_strict(self, dst, incoming_list, strict_mode) {
     // 現時点では基本版と同じ動作
-    return me.lower_phi(dst, incoming_list)
+    return me.lower_phi(self, incoming_list)
   }
 
   // Stage 5 プレースホルダー: 文字列性伝播（将来実装）
   // Python: phi.py 131-142行の resolver.is_stringish() 処理
   // 注: C++バックエンドで実装予定
-  lower_phi_with_string_propagation(dst, incoming_list, resolver) {
+  lower_phi_with_string_propagation(self, dst, incoming_list, resolver) {
     // 現時点では基本版と同じ動作
-    return me.lower_phi(dst, incoming_list)
+    return me.lower_phi(self, incoming_list)
   }
 
   // ヘルパー: incoming要素の検証（デバッグ用）
diff --git a/tools/smokes/v2/profiles/quick/core/phi/self_param_phi_vm.sh b/tools/smokes/v2/profiles/quick/core/phi/self_param_phi_vm.sh
new file mode 100644
index 00000000..2dcd8e53
--- /dev/null
+++ b/tools/smokes/v2/profiles/quick/core/phi/self_param_phi_vm.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+# Verify LLVMPhiInstructionBox.lower_phi requires self (implicit receiver) and returns JSON
+
+source "$(dirname "$0")/../../../lib/test_runner.sh"
+source "$(dirname "$0")/../../../lib/result_checker.sh"
+
+require_env || exit 2
+preflight_plugins || exit 2
+
+test_self_param_phi() {
+  local src='
+using "lang/src/llvm_ir/instructions/phi.hako" as PhiInst
+box Main {
+  static method main() {
+    local incoming = new ArrayBox()
+    local item = new MapBox(); item.set("value", 1); item.set("block", 0); incoming.push(item)
+    local phi = new PhiInst.LLVMPhiInstructionBox().lower_phi(5, incoming)
+    # 判定: 生成文字列に op":"phi が含まれるか（最小）
+    if phi.contains("\"op\":\"phi\"") { print(1) } else { print(0) }
+  }
+}
+'
+  local out
+  out=$(run_nyash_vm -c "$src" 2>&1)
+  check_exact "1" "$out" "self_param_phi"
+}
+
+run_test "self_param_phi" test_self_param_phi
+