diff --git a/src/args.rs b/src/args.rs
index f4bebcc..0bbc356 100644
--- a/src/args.rs
+++ b/src/args.rs
@@ -80,6 +80,9 @@ pub struct ImportArgs {
     #[arg(long)]
     /// Name table file
     pub name_csv: Option<String>,
+    #[arg(long)]
+    /// Replacement table file
+    pub replacement_json: Option<String>,
 }
 
 #[derive(Subcommand, Debug)]
diff --git a/src/main.rs b/src/main.rs
index c2ddd7e..fcc0a76 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -183,6 +183,7 @@ pub fn import_script(
     imp_cfg: &args::ImportArgs,
     is_dir: bool,
     name_csv: Option<&std::collections::HashMap<String, String>>,
+    repl: Option<&types::ReplacementTable>,
 ) -> anyhow::Result<types::ScriptResult> {
     eprintln!("Importing {}", filename);
     let (script, builder) = parse_script(filename, arg, config)?;
@@ -253,7 +254,8 @@ pub fn import_script(
         None => {}
     }
     format::fmt_message(&mut mes, fmt, *builder.script_type());
-    script.import_messages(mes, &patched_f, encoding)?;
+
+    script.import_messages(mes, &patched_f, encoding, repl)?;
     Ok(types::ScriptResult::Ok)
 }
 
@@ -312,6 +314,15 @@ fn main() {
                 }
                 None => None,
             };
+            let repl = match &args.replacement_json {
+                Some(replacement_json) => {
+                    let b = utils::files::read_file(replacement_json).unwrap();
+                    let s = String::from_utf8(b).unwrap();
+                    let table = serde_json::from_str::<types::ReplacementTable>(&s).unwrap();
+                    Some(table)
+                }
+                None => None,
+            };
             let (scripts, is_dir) =
                 utils::files::collect_files(&args.input, arg.recursive).unwrap();
             if is_dir {
@@ -326,7 +337,15 @@ fn main() {
                 }
             }
             for script in scripts.iter() {
-                let re = import_script(&script, &arg, &cfg, args, is_dir, name_csv.as_ref());
+                let re = import_script(
+                    &script,
+                    &arg,
+                    &cfg,
+                    args,
+                    is_dir,
+                    name_csv.as_ref(),
+                    repl.as_ref(),
+                );
                 match re {
                     Ok(s) => {
                         COUNTER.inc(s);
diff --git a/src/scripts/base.rs b/src/scripts/base.rs
index 068d558..0ae2696 100644
--- a/src/scripts/base.rs
+++ b/src/scripts/base.rs
@@ -32,5 +32,6 @@ pub trait Script: std::fmt::Debug {
         messages: Vec<Message>,
         filename: &str,
         encoding: Encoding,
+        replacement: Option<&ReplacementTable>,
     ) -> Result<()>;
 }
diff --git a/src/scripts/bgi/script.rs b/src/scripts/bgi/script.rs
index 42e66f4..954982b 100644
--- a/src/scripts/bgi/script.rs
+++ b/src/scripts/bgi/script.rs
@@ -141,6 +141,7 @@ impl Script for BGIScript {
         _messages: Vec<Message>,
         _filename: &str,
         _encoding: Encoding,
+        _replacement: Option<&ReplacementTable>,
     ) -> Result<()> {
         Ok(())
     }
diff --git a/src/scripts/circus/script.rs b/src/scripts/circus/script.rs
index 1e10537..e929d60 100644
--- a/src/scripts/circus/script.rs
+++ b/src/scripts/circus/script.rs
@@ -228,17 +228,18 @@ impl Script for CircusMesScript {
         messages: Vec<Message>,
         filename: &str,
         encoding: Encoding,
+        replacement: Option<&ReplacementTable>,
     ) -> Result<()> {
         let mut repls = Vec::new();
         if !encoding.is_jis() {
             fn insert_repl(
-                repls: &mut Vec<(&'static str, String)>,
+                repls: &mut Vec<(String, String)>,
                 s: &'static str,
                 encoding: Encoding,
             ) -> Result<()> {
                 let jis = encode_string(Encoding::Cp932, s, true)?;
                 let out = decode_to_string(encoding, &jis)?;
-                repls.push((s, out));
+                repls.push((s.to_string(), out));
                 Ok(())
             }
             let _ = insert_repl(&mut repls, "｛", encoding);
@@ -251,6 +252,14 @@ impl Script for CircusMesScript {
                 crate::COUNTER.inc_warning();
             }
         }
+        match replacement {
+            Some(repl) => {
+                for (k, v) in repl.map.iter() {
+                    repls.push((k.to_string(), v.to_string()));
+                }
+            }
+            None => {}
+        }
         let mut buffer = Vec::with_capacity(self.data.len());
         buffer.extend_from_slice(&self.data[..self.asm_bin_offset]);
         let mut nmes = Vec::with_capacity(messages.len());
@@ -290,7 +299,7 @@ impl Script for CircusMesScript {
                     t
                 };
                 for i in repls.iter() {
-                    s = s.replace(i.0, i.1.as_str());
+                    s = s.replace(i.0.as_str(), i.1.as_str());
                 }
                 let mut text = encode_string(encoding, &s, false)?;
                 buffer.push(token.value);
@@ -323,7 +332,7 @@ impl Script for CircusMesScript {
                     t
                 };
                 for i in repls.iter() {
-                    s = s.replace(i.0, i.1.as_str());
+                    s = s.replace(i.0.as_str(), i.1.as_str());
                 }
                 buffer.push(token.value);
                 let text = encode_string(encoding, &s, false)?;
diff --git a/src/types.rs b/src/types.rs
index 8307751..62bc732 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -1,5 +1,6 @@
 use clap::ValueEnum;
 use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
 
 #[derive(Copy, Clone, Serialize, Deserialize, Debug)]
 #[serde(untagged, rename_all = "camelCase")]
@@ -235,3 +236,9 @@ pub struct NameTableCell {
     #[serde(rename = "Count")]
     pub count: usize,
 }
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ReplacementTable {
+    #[serde(flatten)]
+    pub map: HashMap<String, String>,
+}