diff --git a/kadai4/shiimaxx/omikuji-api/.gitignore b/kadai4/shiimaxx/omikuji-api/.gitignore
new file mode 100644
index 0000000..f1c181e
--- /dev/null
+++ b/kadai4/shiimaxx/omikuji-api/.gitignore
@@ -0,0 +1,12 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
diff --git a/kadai4/shiimaxx/omikuji-api/LICENSE b/kadai4/shiimaxx/omikuji-api/LICENSE
new file mode 100644
index 0000000..e6ddbbf
--- /dev/null
+++ b/kadai4/shiimaxx/omikuji-api/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 YOSHIMA Takatada
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/kadai4/shiimaxx/omikuji-api/README.md b/kadai4/shiimaxx/omikuji-api/README.md
new file mode 100644
index 0000000..4788fec
--- /dev/null
+++ b/kadai4/shiimaxx/omikuji-api/README.md
@@ -0,0 +1,40 @@
+# omikuji-api
+
+omikuji-api responses result for omikuji.  
+The following are responses.
+
+```
+{"result_code":1,"result":"kyo"}
+{"result_code":2,"result":"kichi"}
+{"result_code":3,"result":"kichi"}
+{"result_code":4,"result":"chukichi"}
+{"result_code":5,"result":"chukichi"}
+{"result_code":6,"result":"daikichi"}
+```
+
+This is homework for gopherdojo.  
+See also: https://github.com/gopherdojo/dojo1/tree/master/kadai4
+
+## Usage
+
+```
+omikuji-api [(-p | --port) port]
+```
+
+```
+Usage of omikuji-api:
+  -p int
+        port number(Short) (default 8080)
+  -port int
+        port number (default 8080)
+  -version
+        print version information
+```
+
+## License
+
+[MIT](https://github.com/shiimaxx/omikuji-api/blob/master/LICENSE)
+
+## Author
+
+[shiimaxx](https://github.com/shiimaxx)
diff --git a/kadai4/shiimaxx/omikuji-api/main.go b/kadai4/shiimaxx/omikuji-api/main.go
new file mode 100644
index 0000000..28f0238
--- /dev/null
+++ b/kadai4/shiimaxx/omikuji-api/main.go
@@ -0,0 +1,93 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"math/rand"
+	"net/http"
+	"time"
+	"flag"
+	"fmt"
+	"os"
+)
+
+
+const (
+	// Exit codes are int values that represent an exit code for a particular error.
+	ExitCodeOK    int = 0
+	ExitCodeError int = 1 + iota
+	// DefaultPort default for http server listen port
+ 	DefaultPort = 8080
+)
+
+var (
+	logger = log.New(os.Stdout, "logger: ", log.Lshortfile)
+)
+
+// OmikujiResponse omikuji-api response
+type OmikujiResponse struct {
+	ResultCode int    `json:"result_code"`
+	Result     string `json:"result"`
+}
+
+var getTime = func() time.Time {
+	return time.Now()
+}
+
+func omikuji() (int, string) {
+	t := getTime()
+	if t.Month() == time.January && t.Day() >= 1 && t.Day() <= 3 {
+		return 0, "daikichi"
+	}
+	rand.Seed(t.UnixNano())
+	s := rand.Intn(6) + 1
+
+	switch s {
+	case 1:
+		return s, "kyo"
+	case 2, 3:
+		return s, "kichi"
+	case 4, 5:
+		return s, "chukichi"
+	case 6:
+		return s, "daikichi"
+	default:
+		return s, ""
+	}
+}
+
+// HandleOmikujiAPI omikuji api
+func HandleOmikujiAPI(w http.ResponseWriter, r *http.Request) {
+	logger.Println("request: ", r.URL)
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+
+	var v OmikujiResponse
+	v.ResultCode, v.Result = omikuji()
+
+	if err := json.NewEncoder(w).Encode(v); err != nil {
+		logger.Println("error:", err)
+	}
+}
+
+func main() {
+	var (
+		port    int
+		version bool
+	)
+
+	flags := flag.NewFlagSet(Name, flag.ContinueOnError)
+	flags.IntVar(&port, "port", DefaultPort, "port number")
+	flags.IntVar(&port, "p", DefaultPort, "port number(Short)")
+	flags.BoolVar(&version, "version", false, "print version information")
+	if err := flags.Parse(os.Args[1:]); err != nil {
+		os.Exit(ExitCodeError)
+	}
+
+	if version {
+		fmt.Printf("%s version %s\n", Name, Version)
+		os.Exit(ExitCodeOK)
+	}
+
+	http.HandleFunc("/", HandleOmikujiAPI)
+	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", port), nil))
+}
diff --git a/kadai4/shiimaxx/omikuji-api/main_test.go b/kadai4/shiimaxx/omikuji-api/main_test.go
new file mode 100644
index 0000000..cef80fd
--- /dev/null
+++ b/kadai4/shiimaxx/omikuji-api/main_test.go
@@ -0,0 +1,44 @@
+package main
+
+import (
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestHandleOmikujiAPI(t *testing.T) {
+	w := httptest.NewRecorder()
+	r := httptest.NewRequest("GET", "/", nil)
+	HandleOmikujiAPI(w, r)
+	rw := w.Result()
+	defer rw.Body.Close()
+
+	if rw.StatusCode != http.StatusOK {
+		t.Errorf("expected %d to eq %d", http.StatusOK, rw.StatusCode)
+	}
+}
+
+func TestHandleOmikujiAPIHappyNewYear(t *testing.T) {
+	getTime = func() time.Time { return time.Date(2018, time.January, 1, 0, 0, 0, 0, time.Local) }
+
+	w := httptest.NewRecorder()
+	r := httptest.NewRequest("GET", "/", nil)
+	HandleOmikujiAPI(w, r)
+	rw := w.Result()
+	defer rw.Body.Close()
+
+	if rw.StatusCode != http.StatusOK {
+		t.Errorf("expected %d to eq %d", http.StatusOK, rw.StatusCode)
+	}
+
+	b, _ := ioutil.ReadAll(rw.Body)
+	actual := string(b)
+	expected := "{\"result_code\":0,\"result\":\"daikichi\"}"
+
+	if !strings.Contains(actual, expected) {
+		t.Errorf("expected %s to eq %s", expected, actual)
+	}
+}
diff --git a/kadai4/shiimaxx/omikuji-api/version.go b/kadai4/shiimaxx/omikuji-api/version.go
new file mode 100644
index 0000000..705ca81
--- /dev/null
+++ b/kadai4/shiimaxx/omikuji-api/version.go
@@ -0,0 +1,7 @@
+package main
+
+// Name is the application name
+const Name string = "omikuji-api"
+
+// Version is the application version
+const Version string = "0.1.0"