diff --git a/dev/ysbin_tool.py b/dev/ysbin_tool.py
index 80eac14..614d82e 100644
--- a/dev/ysbin_tool.py
+++ b/dev/ysbin_tool.py
@@ -355,11 +355,13 @@ def extract_dialogue(raw):
 
 # ── pack ─────────────────────────────────────────────────────────────────────
 
-def patch_ystb(raw, translations):
+def patch_ystb(raw, translations, wrap_nl_bytes=b'\x0a'):
     """
     Patch translated text into a YSTB binary.
 
     translations : {src_text: tl_text}
+    wrap_nl_bytes : bytes to insert as line-break separator (default b'\x0a').
+                    YU-RIS native newline is b'\xef\xf0' (two-byte control code).
     Returns patched bytes, or None if nothing changed (no matches found).
 
     Strategy:
@@ -411,6 +413,9 @@ def patch_ystb(raw, translations):
                                 new_bytes = tl.encode('cp932')
                             except Exception:
                                 new_bytes = tl.encode('utf-8')
+                            # Replace sentinel 0x01 with the requested newline bytes
+                            if wrap_nl_bytes != b'\x0a':
+                                new_bytes = new_bytes.replace(b'\x01', wrap_nl_bytes)
                             attr_replacements[attr_idx] = new_bytes
 
                     elif a_type == 3:
@@ -824,6 +829,25 @@ def patch_font_sizes(raw, style_sizes):
     return bytes(new_header) + instr_enc + new_attrs_enc + new_vals_enc + tail
 
 
+# ── word-wrap helper ────────────────────────────────────────────────────────────
+
+def _wrap_text(text, width):
+    """
+    Word-wrap `text` to at most `width` characters per line.
+    Returns the wrapped string with '\n' (0x0a) as the line separator.
+    Preserves any manual '\n' already present in the text.
+    """
+    import textwrap
+    paragraphs = text.split('\n')
+    lines = []
+    for para in paragraphs:
+        if len(para) <= width:
+            lines.append(para)
+        else:
+            lines.extend(textwrap.wrap(para, width=width) or [''])
+    return '\n'.join(lines)
+
+
 # ── CLI commands ──────────────────────────────────────────────────────────────
 
 def cmd_extract(args):
@@ -882,6 +906,12 @@ def cmd_extract(args):
 def cmd_pack(args):
     json_dir  = args.json_dir
     ysbin_dir = args.ysbin_dir
+    wrap_width = getattr(args, 'wrap', 0) or 0
+    wrap_nl_str = getattr(args, 'wrap_newline', 'eff0') or 'eff0'
+    try:
+        wrap_nl_bytes = bytes.fromhex(wrap_nl_str.replace(' ', '').replace('0x', ''))
+    except ValueError:
+        wrap_nl_bytes = b'\xef\xf0'
     patched   = 0
     skipped   = 0
 
@@ -948,6 +978,14 @@ def cmd_pack(args):
             if not e.get('src') or not e.get('tl') or e['tl'] == e['src']:
                 continue
             tl  = e['tl']
+            # Word-wrap English speech text if requested.
+            # Only wrap if the translation looks like English (no CJK).
+            if wrap_width and tl and not any(0x3000 <= ord(c) <= 0x9fff for c in tl):
+                tl = _wrap_text(tl, wrap_width)
+                # If a non-default newline byte is requested, store a sentinel
+                # that will be replaced after cp932 encoding below.
+                if wrap_nl_bytes != b'\x0a':
+                    tl = tl.replace('\n', '\x01')  # temp sentinel (0x01 unused in text)
             key = e.get('_raw', e['src'])
             # Re-attach the ORIGINAL speaker prefix from _raw so the engine
             # continues to recognise the name in its es.CHAR.NAME registry.
@@ -974,7 +1012,7 @@ def cmd_pack(args):
         with open(ybn_path, 'rb') as f:
             raw = f.read()
 
-        result = patch_ystb(raw, translations)
+        result = patch_ystb(raw, translations, wrap_nl_bytes=wrap_nl_bytes)
         if result is None:
             print(f'  SKIP {fname}: no matching strings found in binary')
             skipped += 1
@@ -1375,6 +1413,10 @@ def main():
     p_pack = sub.add_parser('pack', help='JSON → .ybn (patch in-place)')
     p_pack.add_argument('--ysbin-dir', default='data/ysbin')
     p_pack.add_argument('--json-dir',  default='json')
+    p_pack.add_argument('--wrap', type=int, default=0, metavar='N',
+                        help='Auto word-wrap English lines to N chars (0 = off, try 50)')
+    p_pack.add_argument('--wrap-newline', default='eff0', metavar='HEX',
+                        help='Hex bytes for line separator (default: eff0 = YU-RIS native newline 0xEF 0xF0)')
 
     # repack-ypf
     p_ypf = sub.add_parser('repack-ypf', help='data/ysbin/*.ybn → patched .ypf')