diff --git a/CURRENT_TASK.md b/CURRENT_TASK.md
index c4cf6013..21f42099 100644
--- a/CURRENT_TASK.md
+++ b/CURRENT_TASK.md
@@ -65,6 +65,17 @@ Phase 21.7 — VM mir_call state & Primary Flip（green）
   - Canary 拡充（phase2170/*）: push×N、alias、per‑recv差分、flow跨ぎ。Map dup-key 非増分・value_state set→get も緑化。
   - 実行: bash tools/smokes/v2/profiles/quick/core/phase2170/run_all.sh → 全PASS。
 
+Phase 21.8 — Hako Check: Refactor & QuickFix（MVP）
+- T0 QuickFix（--fix-dry-run, text-scope）
+  - HC002 include→using（安全置換）／HC003 using 非引用→引用化／HC016 未使用 alias 行削除／HC014 空スタブ提案。
+  - 統一diff（---/+++/@@）で標準出力。既定OFF（dry-run時のみ）。
+- T1 AST Rename（同一ファイル）
+  - --rename-box <Old> <New>／--rename-method <Box> <Old> <New> を追加。
+  - 定義は AST span 行で安全置換、呼出は `<Box>.<Method>(` を置換。--fix-dry-run で diff 出力。
+- T2 Plan 出力
+  - --fix-plan で refactor_plan.json と sed 雛形（apply_script）を出力（手動レビュー想定）。
+  - 既定挙動は不変。適用は別フェーズ（write-capable provider）で検討。
+
 Remaining (21.4)
 1) Hako Parser MVP 実装（tokenizer/parser_core/ast_emit/cli）【微修整】
 2) Analyzer AST 入力の安定化（必要時のみ AST を使用）
diff --git a/docs/development/strategies/de-rust-roadmap.md b/docs/development/strategies/de-rust-roadmap.md
new file mode 100644
index 00000000..0f44e180
--- /dev/null
+++ b/docs/development/strategies/de-rust-roadmap.md
@@ -0,0 +1,38 @@
+# De‑Rust Roadmap (Phase 21.9+)
+
+Purpose: reduce Rust surface (non‑plugin) while keeping correctness and reversibility. Make Hakorune (Hako) the primary host for parsing/building/executing; keep Rust for kernel/ABI/thin wrappers.
+
+## Phases
+
+### Phase 0 — Archive (low risk)
+- Target: Rust LLVM backend (src/backend/llvm) — deprecated in favor of Python llvmlite.
+- Action: move to `archive/rust-llvm-backend/` with a clear RESTORE.md.
+- Acceptance: `cargo build --release` (default features) remains green; quick smokes green.
+- Revert: `git mv archive/rust-llvm-backend/llvm src/backend/`.
+
+### Phase 1 — Quick Wins (1–2 months)
+- hv1_inline → Hako parity (already functionally covered; keep as perf path).
+- MIR interpreter parity check; route Primary to Hako VM.
+- TLV codec → C shim (FFI) with thin Rust wrapper.
+- LLVM wrapper → Hako/C harness (Python stays primary until Hako IR is ready).
+
+### Phase 2 — Core Thinning (2–4 months)
+- Plugin loader thin C wrapper (dlopen/dlsym), unify host ABI.
+- Basic boxes (Array/Map/File) small C core (handle‑based), keep Rust shim.
+- Resolver/Using: SSOT in Hako; runner uses shared policy.
+
+### Phase 3 — Long‑haul (3–6 months)
+- Python llvmlite → Hako IR builder + C ABI.
+- Parser/MIR builder fully Hako‑first; Rust becomes fallback.
+- NyKernel minimal C runtime (BoxCall dispatcher + collections + file).
+
+## Principles
+- Guard everything by env/features; defaults unchanged.
+- Keep changes reversible (small diffs, RESTORE docs, fallbacks).
+- Test gates: quick smokes + representative hv1/hakovm parity.
+
+## Today (suggested)
+1) Stage Phase‑0 move as a script (not auto‑run) + RESTORE.md.
+2) Add phase docs (docs/private/roadmap/phases/phase-21.9/PLAN.md).
+3) Keep CI/dev instructions intact (no build break when features=none).
+
diff --git a/tools/de_rust/archive_rust_llvm_backend.sh b/tools/de_rust/archive_rust_llvm_backend.sh
new file mode 100644
index 00000000..785ba658
--- /dev/null
+++ b/tools/de_rust/archive_rust_llvm_backend.sh
@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+SRC_DIR="$ROOT/src/backend/llvm"
+DST_DIR="$ROOT/archive/rust-llvm-backend/llvm"
+RESTORE_MD="$ROOT/archive/rust-llvm-backend/RESTORE.md"
+
+echo "[info] De‑Rust Phase‑0: archive Rust LLVM backend"
+
+if [ ! -d "$SRC_DIR" ]; then
+  echo "[warn] src/backend/llvm not found; nothing to do" >&2
+  exit 0
+fi
+
+mkdir -p "$(dirname "$DST_DIR")"
+git mv "$SRC_DIR" "$DST_DIR"
+
+cat > "$RESTORE_MD" <<'EOF'
+# RESTORE — Rust LLVM backend
+
+To restore the archived backend back to the original location:
+
+  git mv archive/rust-llvm-backend/llvm src/backend/
+
+Rationale: Python llvmlite is the primary LLVM path. The Rust backend was deprecated and archived as part of the De‑Rust Phase‑0.
+EOF
+
+echo "[done] Archived to archive/rust-llvm-backend/. Review and commit when ready."
+