diff --git a/honoka/plugins/romkan.cpp b/honoka/plugins/romkan.cpp
index a95304e..f925dfb 100644
--- a/honoka/plugins/romkan.cpp
+++ b/honoka/plugins/romkan.cpp
@@ -49,6 +49,12 @@
         _("input the path of Roma-Kana convert table file."),
         HONOKA_DEFAULT_ROMKAN_TABLE_FILE
     ));
+    page->append(new HonokaSetupKeyItem(
+        _("Ascii to Kana convert key: "),
+        HONOKA_CONFIG_ROMKAN_A2K_KEY,
+        _("The key events to convert the ascii string to kana."),
+        HONOKA_DEFAULT_ROMKAN_A2K_KEY
+    ));
     HonokaSetupPage *sc = new HonokaSetupPage(_("shortcut keys: "),"","");
     sc->append(new HonokaSetupKeyItem(
         _("Romkan input: "),
@@ -213,7 +219,7 @@
     
     //String rk_table = config->read(HONOKA_CONFIG_ROMKAN_TABLE_FILE,String(HONOKA_DEFAULT_ROMKAN_TABLE_FILE));
     String rk_table = config->read(String(HONOKA_CONFIG_ROMKAN_TABLE_FILE) + postfix,String(HONOKA_DEFAULT_ROMKAN_TABLE_FILE));
-    
+    scim_string_to_key_list(key_a2k,config->read(HONOKA_CONFIG_ROMKAN_A2K_KEY,String(HONOKA_DEFAULT_ROMKAN_A2K_KEY)));
     if (rk_table.size()) {
         loadTable(rk_table);
     }
@@ -650,6 +656,10 @@
         (key.code == SCIM_KEY_Super_R) ||
         (key.code == SCIM_KEY_Hyper_L) ||
         (key.code == SCIM_KEY_Hyper_R)) return true;
+    if (key_a2k.comp(key)) {
+        asciiToKana();
+        return true;
+    }
     if (key_ascii_mode.comp(key)) {
         mode = ASCII;
         return true;
@@ -704,3 +714,36 @@
     }
     return l;
 }
+
+
+/*!
+    \fn Honoka::Romkan::asciiToKana()
+ */
+void Honoka::Romkan::asciiToKana()
+{
+    inputMode m = mode;
+    WideString t = text;
+    reset();
+    mode = ROMA;
+    WideString b;
+    for(unsigned int i = 0;i < t.length();i ++) {
+        if (((t[i] >= 0x0041) && (t[i] <= 0x005A)) || ((t[i] >= 0x0061) && (t[i] <= 0x007A))) {
+            b += t[i];
+        } else {
+            if (b.length()) {
+                String s = utf8_wcstombs(b).c_str();
+                for(unsigned int j = 0;j < s.length();j ++) insert(s[j]);
+                b.clear();
+            }
+            text += t[i];
+            setPos(getPos() + 1);
+        }
+    }
+    if (b.length()) {
+        String s = utf8_wcstombs(b).c_str();
+        for(unsigned int j = 0;j < s.length();j ++) insert(s[j]);
+    }
+    mode = m;
+    return;
+
+}
diff --git a/honoka/plugins/romkan.h b/honoka/plugins/romkan.h
index 056081e..28b773f 100644
--- a/honoka/plugins/romkan.h
+++ b/honoka/plugins/romkan.h
@@ -35,6 +35,8 @@
 
 #define HONOKA_CONFIG_ROMKAN_TABLE_FILE            "/IMEngine/Honoka/Romkan/TableFile"
 #define HONOKA_DEFAULT_ROMKAN_TABLE_FILE           "honoka-def.rkt"
+#define HONOKA_CONFIG_ROMKAN_A2K_KEY               "/IMEngine/Honoka/Romkan/AsciiToKana"
+#define HONOKA_DEFAULT_ROMKAN_A2K_KEY              "Hiragana_Katakana"
 
 
 using namespace std;
@@ -101,6 +103,7 @@
     void init();
     void loadTable(const String &filename, bool inc = false);
     bool string2bool(const String &s);
+    void asciiToKana();
 
 protected:
     String buf;
@@ -113,7 +116,7 @@
     bool xtProc;
     bool asciiCancel;
     bool removeRemainder;
-    HonokaKeyEventList key_ascii_mode,key_wascii_mode,key_toggle_hw,key_toggle_hk;
+    HonokaKeyEventList key_ascii_mode,key_wascii_mode,key_toggle_hw,key_toggle_hk,key_a2k;
     map<String,WideString> RomkanTable;
     set<String> keepTable;
     map<String,String> tableConfig;