diff --git a/Cargo.toml b/Cargo.toml
index 2817e24..ddfb0c6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,6 +11,9 @@ crate-type = ["cdylib"]
 napi = { version = "2.12.2", default-features = false, features = ["napi4"] }
 napi-derive = "2.12.2"
 
+jpreprocess = "0.6.0"
+htsengine = { git = "https://github.com/jpreprocess/htsengine-rs.git" }
+
 [build-dependencies]
 napi-build = "2.0.1"
 
diff --git a/src/lib.rs b/src/lib.rs
index b479ed7..9886953 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,9 +1,62 @@
 #![deny(clippy::all)]
 
+use htsengine::HTSEngine;
+use jpreprocess::{JPreprocess, JPreprocessConfig, SystemDictionaryConfig};
+use napi::{Error, Status};
+
 #[macro_use]
 extern crate napi_derive;
 
+#[napi(object)]
+pub struct AltJTalkConfig {
+  pub dictionary: String,
+  pub model: String,
+}
+
+#[napi]
+pub struct AltJTalk {
+  jpreprocess: JPreprocess,
+  htsengine: HTSEngine,
+}
+
 #[napi]
-pub fn sum(a: i32, b: i32) -> i32 {
-  a + b
+impl AltJTalk {
+  #[napi(factory)]
+  pub fn from_config(config: AltJTalkConfig) -> Result<Self, Error> {
+    let mut htsengine = HTSEngine::new();
+    htsengine
+      .load(vec![config.model])
+      .map_err(|err| Error::new(Status::InvalidArg, err))?;
+    Ok(Self {
+      jpreprocess: JPreprocess::from_config(JPreprocessConfig {
+        dictionary: SystemDictionaryConfig::File(config.dictionary.into()),
+        user_dictionary: None,
+      })
+      .map_err(|err| Error::new(Status::InvalidArg, err))?,
+      htsengine,
+    })
+  }
+  #[napi]
+  pub fn synthesize(&mut self, input_text: String) -> Result<Vec<i16>, Error> {
+    let labels = self
+      .jpreprocess
+      .extract_fullcontext(&input_text)
+      .map_err(|err| Error::new(Status::Unknown, err))?;
+    let audio: Vec<i16> = self
+      .htsengine
+      .synthesize(labels)
+      .map_err(|err| Error::new(Status::Unknown, err))?
+      .into_iter()
+      .map(|d| {
+        if d < (i16::MIN as f64) {
+          i16::MIN
+        } else if d > (i16::MAX as f64) {
+          i16::MAX
+        } else {
+          d as i16
+        }
+      })
+      .collect();
+    Ok(audio)
+  }
 }