diff --git a/bot/data.py b/bot/data.py
index 1b7eeb1..9415eaa 100644
--- a/bot/data.py
+++ b/bot/data.py
@@ -1,6 +1,7 @@
 import os
 import sys
 import json
+import csv
 from pathlib import Path
 
 from platformdirs import user_config_dir
@@ -33,6 +34,15 @@ def yomichan_metadata():
     return data
 
 
+def variant_kanji():
+    def loader(data, row):
+        data[row[0]] = row[1]
+    file_name = "variant_kanji.csv"
+    data = {}
+    __load_csv(file_name, loader, data)
+    return data
+
+
 def __default_config():
     file_name = "default_config.json"
     data = __load_json(file_name)
@@ -47,3 +57,15 @@ def __load_json(file_name):
     with open(file_path, "r", encoding="utf-8") as f:
         data = json.load(f)
     return data
+
+
+def __load_csv(file_name, loader, data, delim=',', quote='"'):
+    file_path = os.path.join("data", file_name)
+    if not Path(file_path).is_file():
+        print(f"Missing data file: {file_path}")
+        sys.exit(1)
+    with open(file_path, "r", encoding="utf-8") as f:
+        reader = csv.reader(f, delimiter=delim, quotechar=quote)
+        for row in reader:
+            loader(data, row)
+    return data
diff --git a/bot/entries/jitenon.py b/bot/entries/jitenon.py
index 24f2ad2..9ba61ee 100644
--- a/bot/entries/jitenon.py
+++ b/bot/entries/jitenon.py
@@ -2,11 +2,16 @@ import re
 from datetime import datetime, date
 from bs4 import BeautifulSoup
 
+import bot.data as Data
 import bot.expressions as Expressions
 
 
 class JitenonEntry:
+    _VARIANT_KANJI = None
+
     def __init__(self, entry_id):
+        if self._VARIANT_KANJI is None:
+            self._VARIANT_KANJI = Data.variant_kanji()
         self.entry_id = entry_id
         self.markup = ""
         self.modified_date = date(1970, 1, 1)
@@ -34,6 +39,7 @@ class JitenonEntry:
         if self._headwords is not None:
             return self._headwords
         self._set_headwords()
+        self._set_variant_headwords()
         return self._headwords
 
     def get_first_expression(self):
@@ -148,6 +154,10 @@ class JitenonYojiEntry(JitenonEntry):
     def __init__(self, sequence):
         super().__init__(sequence)
 
+    def _set_variant_headwords(self):
+        for expressions in self._headwords.values():
+            Expressions.add_variant_kanji(expressions, self._VARIANT_KANJI)
+
 
 class JitenonKotowazaEntry(JitenonEntry):
     COLUMNS = {
@@ -170,3 +180,8 @@ class JitenonKotowazaEntry(JitenonEntry):
             }
         else:
             super()._set_headwords()
+
+    def _set_variant_headwords(self):
+        for expressions in self._headwords.values():
+            Expressions.add_variant_kanji(expressions, self._VARIANT_KANJI)
+            Expressions.add_fullwidth(expressions)
diff --git a/bot/expressions.py b/bot/expressions.py
index ba39db6..5168082 100644
--- a/bot/expressions.py
+++ b/bot/expressions.py
@@ -1,5 +1,27 @@
 import re
 
+__WIDE_MAP = {i: i + 0xFEE0 for i in range(0x21, 0x7F)}
+
+
+def add_fullwidth(expressions):
+    for expression in expressions:
+        if re.match(r"[A-Za-z0-9]", expression):
+            new_exp = expression.translate(__WIDE_MAP)
+            if new_exp not in expressions:
+                expressions.append(new_exp)
+
+
+def add_variant_kanji(expressions, variant_kanji):
+    for old_kanji, new_kanji in variant_kanji.items():
+        new_exps = []
+        for expression in expressions:
+            if old_kanji in expression:
+                new_exp = expression.replace(old_kanji, new_kanji)
+                new_exps.append(new_exp)
+        for new_exp in new_exps:
+            if new_exp not in expressions:
+                expressions.append(new_exp)
+
 
 def expand_shouryaku(shouryaku):
     """Return a list of words described by a 省略 notation.
diff --git a/data/variant_kanji.csv b/data/variant_kanji.csv
new file mode 100644
index 0000000..adc6bf3
--- /dev/null
+++ b/data/variant_kanji.csv
@@ -0,0 +1,19 @@
+儘,侭
+凜,凛
+剝,剥
+吞,呑
+啞,唖
+噓,嘘
+嚙,噛
+塡,填
+姸,妍
+搔,掻
+摑,掴
+潑,溌
+竜,龍
+簞,箪
+籠,篭
+藪,薮
+蠟,蝋
+醬,醤
+鶯,鴬