diff --git a/backend/src/api/mod.rs b/backend/src/api/mod.rs
index 8810dfe..35c8173 100644
--- a/backend/src/api/mod.rs
+++ b/backend/src/api/mod.rs
@@ -1,23 +1,39 @@
 use serde::Deserialize;
-use std::{error::Error, marker::Sync};
+use std::{collections::HashMap, error::Error, println, string::String, vec::Vec};
 
 #[derive(Debug, Deserialize)]
 pub struct Problem {
     pub id: String,
     pub contest_id: String,
-    pub title: String,
+    pub name: String,
 }
 
-pub async fn fetch_problem() -> Result<Vec<Problem>, Box<dyn Error + Send + Sync>> {
-    let url = "https://kenkoooo.com/atcoder/resources/problems.json";
+#[derive(Debug, Deserialize)]
+pub struct ProblemModel {
+	pub difficulty: Option<i32>,
+}
+
+pub async fn fetch_problem() -> Result<(Vec<Problem>, HashMap<String, ProblemModel>), Box<dyn Error + Send + Sync>> {
+    // let problems_url = "https://kenkoooo.com/atcoder/resources/problems.json";
+	// let problem_models_url = "https://kenkoooo.com/atcoder/resources/problem-models.json";
+	let problems_url = "https://github.com/Twil3akine/atcoder-random-picker/blob/master/.gitconfig";
+	let problem_models_url = "https://github.com/Twil3akine/atcoder-random-picker/blob/master/.gitconfig";
 
-    // reqwest::Clientを作成し、User-Agentヘッダーを追加
     let client = reqwest::Client::builder()
-        .user_agent("atcoder-random-picker/0.1") // 任意の名前やバージョンを指定
-        .build()?;
+		.user_agent("atcoder-random-picker/0.1 (twil3; contact: twil3akine@gmail.com)")
+	    .build()?;
+
+	// 問題一覧
+    let problems_text = client.get(problems_url).send().await?.text().await?;
+    let problems: Vec<Problem> = serde_json::from_str(&problems_text)?;
+
+	// 問題モデル
+	let problem_models_text = client.get(problem_models_url).send().await?.text().await?;
+	let problem_models: HashMap<String, ProblemModel> = serde_json::from_str(&problem_models_text)?;
 
-    let text = client.get(url).send().await?.text().await?;
-    let problem: Vec<Problem> = serde_json::from_str(&text)?;
+	for (id, model) in &problem_models {
+		println!("{}: {:?}", id, model.difficulty);
+	}
 
-    Ok(problem)
+    Ok((problems, problem_models))
 }
\ No newline at end of file
diff --git a/backend/src/main.rs b/backend/src/main.rs
index 30c7b31..2f76d00 100644
--- a/backend/src/main.rs
+++ b/backend/src/main.rs
@@ -2,11 +2,18 @@ use hyper::service::{make_service_fn, service_fn};
 use hyper::{Server};
 use std::net::SocketAddr;
 use std::convert::Infallible;
+use std::{println};
+use std::result::Result::Err;
 
-use backend::router;
+use backend::{api, router};
 
 #[tokio::main]
 async fn main() {
+  match api::fetch_problem().await {
+    Ok(_ps) => println!("Successed to fetch problems"),
+    Err(e) => eprintln!("Failed to failed problems: {}", e),
+  }
+
   let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
 
   let make_svc = make_service_fn(|_conn| async {