diff --git a/README.md b/README.md
index 1540563..b1b9c68 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,9 @@ Vietnamese Telex is also available as a compatibility mode.
 | `Ctrl+H` | One-shot Hanja search |
 
 A Korean keyboard's 한/영 key toggles Korean and English, and its 한자 key
-is `Ctrl+H`. Only a plain `Ctrl` chord is a strans key: with `Shift`, `Alt`,
+is `Ctrl+H`; a Japanese keyboard's 半角/全角 toggles Japanese and English,
+ひらがな/カタカナ switches between the two kana modes, 変換 turns Japanese on
+and then converts like `Space`, and 無変換 turns it off. Only a plain `Ctrl` chord is a strans key: with `Shift`, `Alt`,
 or `Super` held it commits what is pending and goes to the application, so
 `Ctrl+Shift+V` still pastes.
 
diff --git a/ipc.c b/ipc.c
index 9071b56..8167dc1 100644
--- a/ipc.c
+++ b/ipc.c
@@ -166,7 +166,8 @@ ipcconnect(void)
 /*
  * Engine key for an X keysym and its Unicode value: printable characters
  * as themselves, the function keysyms 0xff00-0xffff as Kspec+offset.
- * The keypad and Shift+Tab (ISO_Left_Tab) variants fold onto Enter and Tab.
+ * The keypad keys and Shift+Tab (ISO_Left_Tab) fold onto their plain
+ * counterparts.
  */
 uint32_t
 ipckeysym(uint32_t sym, uint32_t unicode)
@@ -179,6 +180,14 @@ ipckeysym(uint32_t sym, uint32_t unicode)
 		return Ktab;
 	case 0xff8d:
 		return Kret;
+	case 0xff97:
+		return Kup;
+	case 0xff99:
+		return Kdown;
+	case 0xff9a:
+		return Kpgup;
+	case 0xff9b:
+		return Kpgdown;
 	}
 	if(sym >= 0xff00 && sym <= 0xffff)
 		return Kspec + (sym - 0xff00);
diff --git a/ipc.h b/ipc.h
index 3bedfd9..3275867 100644
--- a/ipc.h
+++ b/ipc.h
@@ -41,6 +41,10 @@ enum
 	Kpgdown = Kspec|0x56,
 	Khangul = Kspec|0x31,
 	Khanja = Kspec|0x34,
+	Kmuhenkan = Kspec|0x22,
+	Khenkan = Kspec|0x23,
+	Kkana = Kspec|0x27,
+	Kzenkaku = Kspec|0x2a,
 	Kmodfirst = Kspec|0xe1,
 	Kmodlast = Kspec|0xee,
 
diff --git a/strans.c b/strans.c
index 7135314..87d8f30 100644
--- a/strans.c
+++ b/strans.c
@@ -765,13 +765,23 @@ transition(u32int ks, u32int mod, Str *com)
 		ks = kokey(ks, mod);
 	else if(isjp(&im))
 		ks = lower(ks);	/* romaji is case-blind, Caps Lock included */
-	/* The Korean keyboard's 한/영 and 한자 keys are Ctrl+S or Ctrl+T, and Ctrl+H. */
-	if(ks == Khangul){
-		ks = im.l->lang == LangKO ? 't' : 's';
-		mod = Mctrl;
-	}else if(ks == Khanja){
-		ks = 'h';
-		mod = Mctrl;
+	/* The Korean and Japanese keyboards' own keys, as the Ctrl chords
+	 * and Space they stand for. */
+	switch(ks){
+	case Khangul:	ks = im.l->lang == LangKO ? 't' : 's'; mod = Mctrl; break;
+	case Khanja:	ks = 'h'; mod = Mctrl; break;
+	case Kzenkaku:	ks = isjp(&im) ? 't' : 'n'; mod = Mctrl; break;
+	case Kkana:	ks = im.l->lang == LangJP ? 'k' : 'n'; mod = Mctrl; break;
+	case Khenkan:
+		if(isjp(&im)){
+			ks = ' ';
+			mod &= Mshift;
+		}else{
+			ks = 'n';
+			mod = Mctrl;
+		}
+		break;
+	case Kmuhenkan:	ks = 't'; mod = Mctrl; break;
 	}
 	if(search.lang)
 		return searchkey(ks, mod, com);
diff --git a/tests/engine_test.c b/tests/engine_test.c
index a0f5967..ccd73be 100644
--- a/tests/engine_test.c
+++ b/tests/engine_test.c
@@ -1965,6 +1965,24 @@ engine_hanja_input_languages(struct ct *t)
 		CT_EQ_INT(t, LangEN, im.l->lang);
 		CT_CHECK(t, keystroke(Khangul, 0, &com));
 		CT_EQ_INT(t, LangKO, im.l->lang);
+		CT_CHECK(t, keystroke(Kzenkaku, 0, &com));
+		CT_EQ_INT(t, LangJP, im.l->lang);
+		CT_CHECK(t, keystroke(Kkana, 0, &com));
+		CT_EQ_INT(t, LangJPK, im.l->lang);
+		CT_CHECK(t, keystroke(Kkana, 0, &com));
+		CT_EQ_INT(t, LangJP, im.l->lang);
+		CT_CHECK(t, keystroke(Kzenkaku, 0, &com));
+		CT_EQ_INT(t, LangEN, im.l->lang);
+		CT_CHECK(t, keystroke(Khenkan, 0, &com));
+		CT_EQ_INT(t, LangJP, im.l->lang);
+		sclear(&com);
+		if(typekeys(t, "ka", &com)){
+			CT_CHECK(t, keystroke(Khenkan, 0, &com));
+			CT_EQ_INT(t, 0, im.sel);
+			CT_CHECK(t, keystroke(Kmuhenkan, 0, &com));
+			checkstr(t, "無変換 commits", "カ", &com);
+			CT_EQ_INT(t, LangEN, im.l->lang);
+		}
 	}
 
 	init();
diff --git a/tests/ipc_test.c b/tests/ipc_test.c
index 964339c..8654e32 100644
--- a/tests/ipc_test.c
+++ b/tests/ipc_test.c
@@ -55,6 +55,7 @@ ipc_masks_modifiers(struct ct *t)
 	CT_EQ_UINT(t, Kret, ipckeysym(0xff0d, '\r'));
 	CT_EQ_UINT(t, Kret, ipckeysym(0xff8d, '\r'));	/* KP_Enter */
 	CT_EQ_UINT(t, Ktab, ipckeysym(0xfe20, 0));	/* ISO_Left_Tab */
+	CT_EQ_UINT(t, Kdown, ipckeysym(0xff99, 0));	/* KP_Down */
 	CT_EQ_UINT(t, Kback, ipckeysym(0xff08, 8));
 	CT_EQ_UINT(t, Kspec + 0xff, ipckeysym(0xffff, 0x7f));	/* Delete */
 	CT_EQ_UINT(t, 0x1f642, ipckeysym(0x101f642, 0x1f642));