diff --git a/tools/mecab2sj4.py b/tools/mecab2sj4.py
new file mode 100755
index 0000000..2daa4ab
--- /dev/null
+++ b/tools/mecab2sj4.py
@@ -0,0 +1,87 @@
+#!/usr/bin/env python3
+
+# THIS IS FOR SYSTEM DICTIONARY GENERATION!!!!!
+
+import re
+import sys
+
+FULLWIDTH_DIGITS = "０１２３４５６７８９"
+FULLWIDTH_ALPHABET = "ａｂｃｄｅｆｇｈｉｊｋｌｍｎｏｐｑｒｓｔｕｖｗｘｙｚＡＢＣＤＥＦＧＨＩＪＫＬＭＮＯＰＱＲＳＴＵＶＷＸＹＺ"
+FULLWIDTH_PUNCTUATION = "！＂＃＄％＆＇（）＊＋，－．／：；＜＝＞？＠［＼］＾＿｀｛｜｝～　"
+FULLWIDTH_ALPHANUMERIC = FULLWIDTH_DIGITS + FULLWIDTH_ALPHABET
+FULLWIDTH_ALL = FULLWIDTH_ALPHANUMERIC + FULLWIDTH_PUNCTUATION
+
+HALFWIDTH_DIGITS = "0123456789"
+HALFWIDTH_ALPHABET = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+HALFWIDTH_PUNCTUATION = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~ "
+HALFWIDTH_ALPHANUMERIC = HALFWIDTH_DIGITS + HALFWIDTH_ALPHABET
+HALFWIDTH_ALL = HALFWIDTH_ALPHANUMERIC + HALFWIDTH_PUNCTUATION
+
+KATAKANA = "アイウエオカキクケコタチツテトナニヌネノハヒフヘホマミムメモヤユヨラリルレロワヲン"
+HIRAGANA = "あいうえおかきくけこたちつてとなにぬねのはひふへほまみむめもやゆよらりるれろわをん"
+
+if len(sys.argv) != 3:
+	print("usage: mecab2sj4.py input.csv output.dic", file=sys.stderr)
+	sys.exit(1)
+
+inp = sys.argv[1]
+outp = sys.argv[2]
+
+try:
+	fp = open("dict/visual.plus.dic", "r")
+except:
+	fp = open("../dict/visual.plus.dic", "r")
+
+dic = {}
+fhtrans = str.maketrans(FULLWIDTH_ALL, HALFWIDTH_ALL)
+hftrans = str.maketrans(HALFWIDTH_ALL, FULLWIDTH_ALL)
+khtrans = str.maketrans(KATAKANA, HIRAGANA)
+
+for lineno, line in enumerate(fp, 1):
+	line = line.rstrip()
+
+	if not(line):
+		continue
+
+	words = list(filter(None, re.split(r'[: \t]+', line)))
+	for i in words[2:]:
+		if not(words[0] in dic):
+			dic[words[0]] = {
+				"types": [],
+				"write": words[1].translate(hftrans)
+			}
+		if not(i in dic[words[0]]["types"]):
+			dic[words[0]]["types"].append(i)
+
+fp = open(inp, "r")
+for lineno, line in enumerate(fp, 1):
+	line = line.rstrip()
+
+	if not(line):
+		continue
+
+	words = line.split(',')
+	types = words[4:10]
+	read = words[11].translate(khtrans)
+	write = words[0].translate(fhtrans)
+	if not(read in dic):
+		next
+
+def reptab(s):
+	n = 4 - int(len(s) / 4)
+
+	return "	" * n
+
+fp = open(outp, "w")
+s = sorted(list(dic.keys()))
+for i in s:
+	n = 0
+	print(i + reptab(i) + dic[i]["write"] + reptab(dic[i]["write"]), end="", file=fp)
+	for j in dic[i]["types"]:
+		if n == 4:
+			print("", file=fp)
+			print(i + reptab(i) + dic[i]["write"] + reptab(dic[i]["write"]), end="", file=fp)
+			n = 0
+		print(j + ":", end="", file=fp)
+		n = n + 1
+	print("", file=fp)