diff --git a/Cargo.lock b/Cargo.lock
index 30d95ac..466f787 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1374,6 +1374,27 @@ dependencies = [
  "minimal-lexical",
 ]
 
+[[package]]
+name = "npyz"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "13f27ea175875c472b3df61ece89a6d6ef4e0627f43704e400c782f174681ebd"
+dependencies = [
+ "byteorder",
+ "num-bigint",
+ "py_literal",
+]
+
+[[package]]
+name = "num-bigint"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a5e44f723f1133c9deac646763579fdb3ac745e418f2a7af9cd0c431da1f20b9"
+dependencies = [
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-complex"
 version = "0.4.6"
@@ -1513,6 +1534,51 @@ version = "2.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3148f5046208a5d56bcfc03053e3ca6334e51da8dfb19b6cdc8b306fae3283e"
 
+[[package]]
+name = "pest"
+version = "2.7.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "879952a81a83930934cbf1786752d6dedc3b1f29e8f8fb2ad1d0a36f377cf442"
+dependencies = [
+ "memchr",
+ "thiserror",
+ "ucd-trie",
+]
+
+[[package]]
+name = "pest_derive"
+version = "2.7.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d214365f632b123a47fd913301e14c946c61d1c183ee245fa76eb752e59a02dd"
+dependencies = [
+ "pest",
+ "pest_generator",
+]
+
+[[package]]
+name = "pest_generator"
+version = "2.7.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb55586734301717aea2ac313f50b2eb8f60d2fc3dc01d190eefa2e625f60c4e"
+dependencies = [
+ "pest",
+ "pest_meta",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "pest_meta"
+version = "2.7.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b75da2a70cf4d9cb76833c990ac9cd3923c9a8905a8929789ce347c84564d03d"
+dependencies = [
+ "once_cell",
+ "pest",
+ "sha2",
+]
+
 [[package]]
 name = "phf"
 version = "0.11.2"
@@ -1606,6 +1672,19 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "py_literal"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "102df7a3d46db9d3891f178dcc826dc270a6746277a9ae6436f8d29fd490a8e1"
+dependencies = [
+ "num-bigint",
+ "num-complex",
+ "num-traits",
+ "pest",
+ "pest_derive",
+]
+
 [[package]]
 name = "pyo3"
 version = "0.22.6"
@@ -1893,11 +1972,13 @@ name = "sbv2_core"
 version = "0.2.0-alpha4"
 dependencies = [
  "anyhow",
+ "base64 0.22.1",
  "dotenvy",
  "env_logger",
  "hound",
  "jpreprocess",
  "ndarray",
+ "npyz",
  "num_cpus",
  "once_cell",
  "ort",
@@ -2284,6 +2365,12 @@ version = "1.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
 
+[[package]]
+name = "ucd-trie"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2896d95c02a80c6d6a5d6e953d479f5ddf2dfdb6a244441010e373ac0fb88971"
+
 [[package]]
 name = "unicode-bidi"
 version = "0.3.17"
diff --git a/sbv2_core/Cargo.toml b/sbv2_core/Cargo.toml
index 4f84986..9d830fb 100644
--- a/sbv2_core/Cargo.toml
+++ b/sbv2_core/Cargo.toml
@@ -10,11 +10,13 @@ documentation = "https://docs.rs/sbv2_core"
 
 [dependencies]
 anyhow.workspace = true
+base64 = { version = "0.22.1", optional = true }
 dotenvy.workspace = true
 env_logger.workspace = true
 hound = "3.5.1"
 jpreprocess = { version = "0.10.0", features = ["naist-jdic"] }
 ndarray.workspace = true
+npyz = { version = "0.8.3", optional = true }
 num_cpus = "1.16.0"
 once_cell.workspace = true
 ort = { git = "https://github.com/pykeio/ort.git", version = "2.0.0-rc.8", optional = true }
@@ -35,4 +37,6 @@ directml = ["ort/directml", "std"]
 tensorrt = ["ort/tensorrt", "std"]
 coreml = ["ort/coreml", "std"]
 default = ["std"]
-no_std = ["tokenizers/unstable_wasm"]
\ No newline at end of file
+no_std = ["tokenizers/unstable_wasm"]
+aivmx = ["npyz", "base64"]
+base64 = ["dep:base64"]
diff --git a/sbv2_core/src/error.rs b/sbv2_core/src/error.rs
index 6bb449e..57c2c48 100644
--- a/sbv2_core/src/error.rs
+++ b/sbv2_core/src/error.rs
@@ -21,6 +21,9 @@ pub enum Error {
     HoundError(#[from] hound::Error),
     #[error("model not found error")]
     ModelNotFoundError(String),
+    #[cfg(feature = "base64")]
+    #[error("base64 error")]
+    Base64Error(#[from] base64::DecodeError),
     #[error("other")]
     OtherError(String),
 }
diff --git a/sbv2_core/src/tts.rs b/sbv2_core/src/tts.rs
index 4e30819..49a94b6 100644
--- a/sbv2_core/src/tts.rs
+++ b/sbv2_core/src/tts.rs
@@ -3,6 +3,12 @@ use crate::{jtalk, model, style, tokenizer, tts_util};
 use ndarray::{concatenate, Array1, Array2, Array3, Axis};
 use ort::Session;
 use tokenizers::Tokenizer;
+#[cfg(feature = "aivmx")]
+use base64::prelude::{Engine as _, BASE64_STANDARD};
+#[cfg(feature = "aivmx")]
+use std::io::Cursor;
+#[cfg(feature = "aivmx")]
+use ndarray::ShapeBuilder;
 
 #[derive(PartialEq, Eq, Clone)]
 pub struct TTSIdent(String);
@@ -69,6 +75,55 @@ impl TTSModelHolder {
         self.models.iter().map(|m| m.ident.to_string()).collect()
     }
 
+    #[cfg(feature = "aivmx")]
+    pub fn load_aivmx<I: Into<TTSIdent>, P: AsRef<[u8]>>(
+        &mut self,
+        ident: I,
+        aivmx_bytes: P
+    ) -> Result<()> {
+        let ident = ident.into();
+        if self.find_model(ident.clone()).is_err() {
+            let mut load = true;
+            if let Some(max) = self.max_loaded_models {
+                if self.models.iter().filter(|x| x.vits2.is_some()).count() >= max {
+                    load = false;
+                }
+            }
+            let model = model::load_model(aivmx_bytes, false)?;
+            let metadata = model.metadata()?;
+            if let Some(aivm_style_vectors) = metadata.custom("aivm_style_vectors")? {
+                let style_vectors = Cursor::new(&BASE64_STANDARD.decode(aivm_style_vectors)?);
+                let reader = npyz::NpyFile::new(style_vectors)?;
+                let style_vectors = {
+                    let shape = reader.shape().to_vec();
+                    let order = reader.order();
+                    let data = reader.into_vec::<f32>()?;
+                    let shape = match shape[..] {
+                        [i1, i2] => [i1 as usize, i2 as usize],
+                        _  => panic!("expected 2D array"),
+                    };
+                    let true_shape = shape.set_f(order == npyz::Order::Fortran);
+                    ndarray::Array2::from_shape_vec(true_shape, data)?
+                };
+                self.models.push(TTSModel {
+                    vits2: if load {
+                        Some(model)
+                    } else {
+                        None
+                    },
+                    bytes: if self.max_loaded_models.is_some() {
+                        Some(aivmx_bytes.as_ref().to_vec())
+                    } else {
+                        None
+                    },
+                    ident,
+                    style_vectors,
+                })
+            }
+        }
+        Ok(())
+    }
+
     /// Load a .sbv2 file binary
     ///
     /// # Examples