diff --git a/docs/development/current/main/10-Now.md b/docs/development/current/main/10-Now.md
index 63da4cf3..cc1efb23 100644
--- a/docs/development/current/main/10-Now.md
+++ b/docs/development/current/main/10-Now.md
@@ -1,8 +1,13 @@
 # Self Current Task — Now (main)
 
-## Current Focus: Phase 284 P0 (design-first) / Post Phase 286
+## Current Focus: Phase 285 P0 (docs-only)
 
-Phase 286 で JoinIR line の主要 pattern（1–9）が Plan/Frag SSOT に吸収できた。次は “出口語彙” をさらに SSOT に寄せるため、Phase 284（Return as ExitKind SSOT）へ進む。
+Box lifecycle / weakref / finalization / GC の “実装が仕様” を止めるため、まず docs-only で SSOT と差分運用（VM/LLVM）を固定する。
+
+**2025-12-26: Phase 284 P2 完了** ✅
+- return を含む loop（Pattern5）を VM で smoke 固定
+- LLVM harness は理由付き SKIP（ビルドに LLVM feature なし）
+- quick smoke 154/154 PASS 維持
 
 設計相談（将来の正規化）:
 - `docs/development/current/main/investigations/phase-286-plan-normalization-consult.md`
@@ -23,7 +28,8 @@ Phase 286 で JoinIR line の主要 pattern（1–9）が Plan/Frag SSOT に吸
 - quick smoke 154/154 PASS 維持、Pattern1/4 PoC 両方 PASS
 
 **次のステップ**:
-1. **Phase 284（design-first）**: Return as ExitKind SSOT（pattern に散らさない）
+1. **Phase 285 P0（docs-only）**: lifecycle/weak/finalization/GC の SSOT 固定
+   - 手順書: `docs/development/current/main/phases/phase-285/P0-INSTRUCTIONS.md`
 2. **future design（separate phase）**: Plan 生成の正規化をどう進めるか（相談パケット）
    - `docs/development/current/main/investigations/phase-286-plan-normalization-consult.md`
 3. （optional, post self-host）REPL = script engine 構想（docs-only）
diff --git a/docs/development/current/main/phases/phase-284/P2-INSTRUCTIONS.md b/docs/development/current/main/phases/phase-284/P2-INSTRUCTIONS.md
new file mode 100644
index 00000000..bc70b883
--- /dev/null
+++ b/docs/development/current/main/phases/phase-284/P2-INSTRUCTIONS.md
@@ -0,0 +1,59 @@
+# Phase 284 P2: "return in loop" smoke 固定（手順書）
+
+## 目的
+
+- return を含む loop を **VM と LLVM harness** の両方で同一結果にする
+- integration smoke で意味論を固定し、退行を防止
+- quick gate (154/154 PASS) は絶対に壊さない
+
+## 対象 fixture（既存再利用優先）
+
+| Fixture | Pattern | 期待値 | 備考 |
+|---------|---------|--------|------|
+| `apps/tests/phase286_pattern5_return_min.hako` | Pattern5 (infinite + early return) | exit 7 | 既存（Phase 286 P3.2 で作成）|
+
+**新規 fixture は追加しない**（既存で十分）
+
+## smoke スクリプト
+
+### VM 版
+- ファイル: `tools/smokes/v2/profiles/integration/apps/phase284_p2_return_in_loop_vm.sh`
+- 実行: `./target/release/hakorune --backend vm <fixture>`
+- 判定: exit code または stdout で固定
+
+### LLVM 版
+- ファイル: `tools/smokes/v2/profiles/integration/apps/phase284_p2_return_in_loop_llvm.sh`
+- 実行: `NYASH_LLVM_USE_HARNESS=1 ./target/release/hakorune --backend llvm <fixture>`
+- SKIP ポリシー: LLVM feature がビルドに含まれていない場合は `test_skip` で理由付き SKIP
+
+```bash
+# SKIP 流儀（v2 smoke 既存パターン準拠）
+if ! "$NYASH_BIN" --version 2>/dev/null | grep -q "features.*llvm"; then
+  test_skip "LLVM backend not available in this build"; exit 0
+fi
+```
+
+## 受け入れ条件
+
+- [ ] `tools/smokes/v2/run.sh --profile quick` → 154/154 PASS
+- [ ] `phase284_p2_return_in_loop_vm.sh` → PASS (exit 7)
+- [ ] `phase284_p2_return_in_loop_llvm.sh` → PASS (exit 7) または理由付き SKIP
+
+## 検証コマンド
+
+```bash
+# quick gate（必須）
+./tools/smokes/v2/run.sh --profile quick
+
+# integration 単発
+bash tools/smokes/v2/profiles/integration/apps/phase284_p2_return_in_loop_vm.sh
+bash tools/smokes/v2/profiles/integration/apps/phase284_p2_return_in_loop_llvm.sh
+
+# integration 全体（フィルタ付き）
+./tools/smokes/v2/run.sh --profile integration --filter "*phase284*"
+```
+
+## 完了後
+
+1. `docs/development/current/main/phases/phase-284/README.md` の P2 を `✅ COMPLETE` に更新
+2. `docs/development/current/main/10-Now.md` の Current Focus を次タスクに更新
diff --git a/docs/development/current/main/phases/phase-284/README.md b/docs/development/current/main/phases/phase-284/README.md
index 2dc52778..63b4477e 100644
--- a/docs/development/current/main/phases/phase-284/README.md
+++ b/docs/development/current/main/phases/phase-284/README.md
@@ -94,10 +94,28 @@ Phase 284 の完了条件は「`return` を含むケースが close-but-unsuppor
 - Block remapping: Duplicate logic → SSOT function
 - Future reusability: Pattern5 can now reuse return_jump_emitter
 
-### P2+（未実装）
+### P2（smoke 固定） ✅ COMPLETE (2025-12-26)
 
-- `return` を含む loop body を、Plan line でも ExitKind::Return に落とす。
-- VM/LLVM の両方で、`return` を含む fixture を smoke 化して SSOT を固定する。
+**目的**: return を含む loop を VM/LLVM 両方で同一結果にし、integration smoke で固定。
+
+**対象 fixture（既存再利用優先）**:
+- `apps/tests/phase286_pattern5_return_min.hako` (exit 7) - Return-in-infinite-loop
+
+**smoke スクリプト**:
+- `tools/smokes/v2/profiles/integration/apps/phase284_p2_return_in_loop_vm.sh` (VM)
+- `tools/smokes/v2/profiles/integration/apps/phase284_p2_return_in_loop_llvm.sh` (LLVM harness)
+
+**受け入れ条件**:
+- integration（VM）PASS
+- integration（LLVM harness）PASS（または理由付き段階完了）
+- quick 154/154 PASS 維持
+
+**詳細手順**: `P2-INSTRUCTIONS.md`
+
+### P3+（将来）
+
+- 他の return パターン（Pattern8 等）の smoke 追加
+- LLVM AOT 経路での return 検証
 
 ## Acceptance
 
diff --git a/tools/smokes/v2/profiles/integration/apps/phase284_p2_return_in_loop_llvm.sh b/tools/smokes/v2/profiles/integration/apps/phase284_p2_return_in_loop_llvm.sh
new file mode 100644
index 00000000..a148507c
--- /dev/null
+++ b/tools/smokes/v2/profiles/integration/apps/phase284_p2_return_in_loop_llvm.sh
@@ -0,0 +1,43 @@
+#!/bin/bash
+# Phase 284 P2: "return in loop" LLVM harness smoke test
+# Purpose: Verify return-in-loop works correctly in LLVM backend (VM/LLVM parity)
+# Uses existing Phase 286 Pattern5 fixture for reuse
+#
+# Expected: exit code 7 or "RC: 7" output (same as VM)
+# SKIP: If LLVM backend not available in build
+
+source "$(dirname "$0")/../../../lib/test_runner.sh"
+export SMOKES_USE_PYVM=0
+require_env || exit 2
+
+# LLVM feature check (v2 smoke SKIP convention)
+if ! "$NYASH_BIN" --version 2>/dev/null | grep -q "features.*llvm"; then
+    test_skip "phase284_p2_return_in_loop_llvm: LLVM backend not available in this build"
+    exit 0
+fi
+
+INPUT="$NYASH_ROOT/apps/tests/phase286_pattern5_return_min.hako"
+RUN_TIMEOUT_SECS=${RUN_TIMEOUT_SECS:-30}
+
+set +e
+OUTPUT=$(timeout "$RUN_TIMEOUT_SECS" env NYASH_LLVM_USE_HARNESS=1 NYASH_DISABLE_PLUGINS=1 "$NYASH_BIN" --backend llvm "$INPUT" 2>&1)
+EXIT_CODE=$?
+set -e
+
+if [ "$EXIT_CODE" -eq 124 ]; then
+    test_fail "phase284_p2_return_in_loop_llvm: timed out (>${RUN_TIMEOUT_SECS}s)"
+    exit 1
+fi
+
+# Expected: exit code 7 or "RC: 7" in output (same as VM)
+if [ "$EXIT_CODE" -eq 7 ] || echo "$OUTPUT" | grep -qE "(^7$|RC: 7$)"; then
+    test_pass "phase284_p2_return_in_loop_llvm: return-in-loop succeeded (exit/output: 7)"
+    exit 0
+else
+    echo "[FAIL] Unexpected result (expected: 7, same as VM)"
+    echo "[INFO] Exit code: $EXIT_CODE"
+    echo "[INFO] Output:"
+    echo "$OUTPUT" | head -n 30 || true
+    test_fail "phase284_p2_return_in_loop_llvm: VM/LLVM parity failed"
+    exit 1
+fi
diff --git a/tools/smokes/v2/profiles/integration/apps/phase284_p2_return_in_loop_vm.sh b/tools/smokes/v2/profiles/integration/apps/phase284_p2_return_in_loop_vm.sh
new file mode 100644
index 00000000..554c74f8
--- /dev/null
+++ b/tools/smokes/v2/profiles/integration/apps/phase284_p2_return_in_loop_vm.sh
@@ -0,0 +1,36 @@
+#!/bin/bash
+# Phase 284 P2: "return in loop" VM smoke test
+# Purpose: Verify return-in-loop works correctly in VM backend
+# Uses existing Phase 286 Pattern5 fixture for reuse
+#
+# Expected: exit code 7 or "RC: 7" output
+
+source "$(dirname "$0")/../../../lib/test_runner.sh"
+export SMOKES_USE_PYVM=0
+require_env || exit 2
+
+INPUT="$NYASH_ROOT/apps/tests/phase286_pattern5_return_min.hako"
+RUN_TIMEOUT_SECS=${RUN_TIMEOUT_SECS:-10}
+
+set +e
+OUTPUT=$(timeout "$RUN_TIMEOUT_SECS" env NYASH_DISABLE_PLUGINS=1 "$NYASH_BIN" --backend vm "$INPUT" 2>&1)
+EXIT_CODE=$?
+set -e
+
+if [ "$EXIT_CODE" -eq 124 ]; then
+    test_fail "phase284_p2_return_in_loop_vm: timed out (>${RUN_TIMEOUT_SECS}s)"
+    exit 1
+fi
+
+# Expected: exit code 7 or "RC: 7" in output
+if [ "$EXIT_CODE" -eq 7 ] || echo "$OUTPUT" | grep -qE "(^7$|RC: 7$)"; then
+    test_pass "phase284_p2_return_in_loop_vm: return-in-loop succeeded (exit/output: 7)"
+    exit 0
+else
+    echo "[FAIL] Unexpected result (expected: 7)"
+    echo "[INFO] Exit code: $EXIT_CODE"
+    echo "[INFO] Output:"
+    echo "$OUTPUT" | head -n 20 || true
+    test_fail "phase284_p2_return_in_loop_vm: Unexpected result"
+    exit 1
+fi