diff -urN v1/ezhtml.py v2/ezhtml.py
--- v1/ezhtml.py	2018-09-16 16:32:39.000000000 +0900
+++ v2/ezhtml.py	2018-09-17 00:15:20.000000000 +0900
@@ -3,6 +3,7 @@
 import sys
 import yaml
 import six
+import nkf
 
 def cv_amp(s, d='enc'):
 	lst = [ ('&','&amp;'), ('<','&lt;'), ('>','&gt;') ]
@@ -28,15 +29,16 @@
 	return cv_amp(o)
 
 if __name__ == "__main__":
-	fi = sys.stdin if six.PY2 else sys.stdin.buffer
-	s = fi.read()
-	s = unicode(s, 'utf-8') if six.PY2 else s.decode()
+	b = nkf.get_stdin()
+	opt = nkf.guess(b)
+	u8 = nkf.cvt(b, '-u')
+	s = nkf.dec(u8)
 
 	o = yaml.load(s)
 
 	s = html_dump(o) + '\n'
-	s = s.encode('utf-8') if six.PY2 else s.encode()
 
-	fo = sys.stdout if six.PY2 else sys.stdout.buffer
-	fo.write(s)
+	u8 = nkf.enc(s)
+	b = nkf.cvt(u8, opt)
+	nkf.put_stdout(b)
 # EOF
diff -urN v1/nkf.py v2/nkf.py
--- v1/nkf.py	1970-01-01 09:00:00.000000000 +0900
+++ v2/nkf.py	2018-09-17 00:15:20.000000000 +0900
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+
+import sys
+import six
+import subprocess
+
+PIPE = subprocess.PIPE
+
+enc = lambda s: s.encode('utf-8') if six.PY2 else s.encode()
+dec = lambda b: unicode(b, 'utf-8') if six.PY2 else b.decode()
+
+def do_cmd(cmd, in_b):
+	cmd = enc(cmd)
+	proc = subprocess.Popen(cmd, shell=True, stdin=PIPE, stdout=PIPE)
+	proc.stdin.write(in_b)
+	proc.stdin.close()
+	r = proc.stdout.read()
+	proc.wait()
+	return r # out_b
+
+def get_stdin():
+	fi = sys.stdin if six.PY2 else sys.stdin.buffer
+	return fi.read() # b
+
+def put_stdout(b):
+	fo = sys.stdout if six.PY2 else sys.stdout.buffer
+	fo.write(b)
+
+def guess(b):
+	b = do_cmd('nkf -g', b)
+	return dec(b).strip()
+
+def cvt(b, opt):
+	if opt == 'ASCII':
+		return b
+	d = {
+		'ISO-2022-JP': '-j',
+		'EUC-JP': '-e',
+		'Shift_JIS': '-s',
+		'UTF-8': '-u',
+	}
+	if opt not in d.values():
+		opt = d.get(opt, '-u')
+	return do_cmd('nkf ' + opt, b)
+
+if __name__ == "__main__":
+	b = get_stdin()
+	opt = guess(b)
+	u8 = cvt(b, '-u')
+	s = dec(u8)
+	# ...
+	u8 = enc(s)
+	b = cvt(u8, opt)
+	put_stdout(b)
+# EOF