diff --git a/kadai4/matsumatsu20/.gitignore b/kadai4/matsumatsu20/.gitignore
new file mode 100644
index 0000000..2dd3cba
--- /dev/null
+++ b/kadai4/matsumatsu20/.gitignore
@@ -0,0 +1,95 @@
+# Created by https://www.gitignore.io/api/go,intellij+all
+
+### Go ###
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+matsukuji
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+### Go Patch ###
+/vendor/
+/Godeps/
+
+### Intellij+all ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+### Intellij+all Patch ###
+# Ignores the whole .idea folder and all .iml files
+# See https://github.com/joeblau/gitignore.io/issues/186 and https://github.com/joeblau/gitignore.io/issues/360
+.idea/
+
+# Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-249601023
+*.iml
+modules.xml
+.idea/misc.xml
+*.ipr
+
+# End of https://www.gitignore.io/api/go,intellij+all
\ No newline at end of file
diff --git a/kadai4/matsumatsu20/Makefile b/kadai4/matsumatsu20/Makefile
new file mode 100644
index 0000000..8d260bc
--- /dev/null
+++ b/kadai4/matsumatsu20/Makefile
@@ -0,0 +1,15 @@
+# Go パラメータ
+GOCMD=go
+GOBUILD=$(GOCMD) build
+GOCLEAN=$(GOCMD) clean
+GOTEST=$(GOCMD) test
+BINARY_NAME=matsukuji
+ all: test build
+build:
+	$(GOBUILD) -o $(BINARY_NAME) -v
+test:
+	$(GOTEST) -v ./...
+clean:
+	$(GOCLEAN)
+	rm -f $(BINARY_NAME)
+	rm -f $(BINARY_UNIX)
diff --git a/kadai4/matsumatsu20/README.md b/kadai4/matsumatsu20/README.md
new file mode 100644
index 0000000..fe7b214
--- /dev/null
+++ b/kadai4/matsumatsu20/README.md
@@ -0,0 +1,16 @@
+# おみくじAPIを作ってみよう
+
+## 課題事項
+- [x] JSON形式でおみくじの結果を返す
+- [x] 正月（1/1-1/3）だけ大吉にする
+- [x] ハンドラのテストを書いてみる
+
+## Usage
+### build
+```bash
+% make build
+```
+ ### run
+```bash
+% ./matsukuji
+```
\ No newline at end of file
diff --git a/kadai4/matsumatsu20/dateUtil/dateUtil.go b/kadai4/matsumatsu20/dateUtil/dateUtil.go
new file mode 100644
index 0000000..13c5590
--- /dev/null
+++ b/kadai4/matsumatsu20/dateUtil/dateUtil.go
@@ -0,0 +1,22 @@
+package dateUtil
+
+import (
+	"log"
+	"time"
+)
+
+var timeNow = time.Now()
+
+func IsNewYearsHoliday() bool {
+	jst, err := time.LoadLocation("Asia/Tokyo")
+	if err != nil {
+		log.Println(err)
+	}
+
+	_, month, day := timeNow.In(jst).Date()
+	if month == time.January && (day == 1 || day == 2 || day == 3) {
+		return true
+	}
+
+	return false
+}
diff --git a/kadai4/matsumatsu20/dateUtil/dateUtil_test.go b/kadai4/matsumatsu20/dateUtil/dateUtil_test.go
new file mode 100644
index 0000000..5c1c8cd
--- /dev/null
+++ b/kadai4/matsumatsu20/dateUtil/dateUtil_test.go
@@ -0,0 +1,36 @@
+package dateUtil
+
+import (
+	"log"
+	"testing"
+	"time"
+)
+
+func TestIsNewYearsHoliday(t *testing.T) {
+	jst, err := time.LoadLocation("Asia/Tokyo")
+	if err != nil {
+		log.Println(err)
+	}
+
+	cases := []struct {
+		year     int
+		month    time.Month
+		day      int
+		expected bool
+	}{
+		{2018, 12, 31, false},
+		{2019, 1, 1, true},
+		{2019, 1, 2, true},
+		{2019, 1, 3, true},
+		{2019, 1, 4, false},
+	}
+
+	for _, c := range cases {
+		timeNow = time.Date(c.year, c.month, c.day, 0, 0, 0, 0, jst)
+		actual := IsNewYearsHoliday()
+
+		if actual != c.expected {
+			t.Errorf("%v is expected, but returned %v", c.expected, actual)
+		}
+	}
+}
diff --git a/kadai4/matsumatsu20/main.go b/kadai4/matsumatsu20/main.go
new file mode 100644
index 0000000..13efc7d
--- /dev/null
+++ b/kadai4/matsumatsu20/main.go
@@ -0,0 +1,19 @@
+package main
+
+import (
+	"flag"
+	"log"
+	"net/http"
+
+	"github.com/gopherdojo/dojo3/kadai4/matsumatsu20/omikuji"
+)
+
+var port = flag.String("p", "8080", "listen port")
+
+func main() {
+	http.HandleFunc("/kuji", omikuji.Handler)
+
+	if err := http.ListenAndServe(":"+*port, nil); err != nil {
+		log.Fatal("ListenAndServe: ", err)
+	}
+}
diff --git a/kadai4/matsumatsu20/omikuji/omikuji.go b/kadai4/matsumatsu20/omikuji/omikuji.go
new file mode 100644
index 0000000..26bf6c9
--- /dev/null
+++ b/kadai4/matsumatsu20/omikuji/omikuji.go
@@ -0,0 +1,55 @@
+package omikuji
+
+import (
+	"encoding/json"
+	"log"
+	"math/rand"
+	"net/http"
+	"time"
+
+	"github.com/gopherdojo/dojo3/kadai4/matsumatsu20/dateUtil"
+)
+
+type response struct {
+	Status int    `json:"status"`
+	Result string `json:"result"`
+}
+
+const (
+	daikichi = "大吉"
+	kichi    = "吉"
+	chukichi = "中吉"
+	shokichi = "小吉"
+	suekichi = "末吉"
+	kyo      = "凶"
+	daikyo   = "大凶"
+)
+
+var (
+	luck                  = []string{daikichi, kichi, chukichi, shokichi, suekichi, kyo, daikyo}
+	isNewYearsHolidayFunc = dateUtil.IsNewYearsHoliday
+	fetchKujiFunc         = fetchKuji
+)
+
+func Handler(w http.ResponseWriter, r *http.Request) {
+	var result string
+
+	if isNewYearsHolidayFunc() {
+		result = daikichi
+	} else {
+		rand.Seed(time.Now().UnixNano())
+		result = fetchKujiFunc()
+	}
+
+	res := &response{Status: 200, Result: result}
+
+	encoder := json.NewEncoder(w)
+	if err := encoder.Encode(res); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func fetchKuji() string {
+	rand.Seed(time.Now().UnixNano())
+	return luck[rand.Intn(len(luck))]
+}
diff --git a/kadai4/matsumatsu20/omikuji/omikuji_test.go b/kadai4/matsumatsu20/omikuji/omikuji_test.go
new file mode 100644
index 0000000..3c45894
--- /dev/null
+++ b/kadai4/matsumatsu20/omikuji/omikuji_test.go
@@ -0,0 +1,56 @@
+package omikuji
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestHandler(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(Handler))
+	defer ts.Close()
+
+	cases := []struct {
+		luck              string
+		isNewYearsHoliday bool
+		expected          response
+	}{
+		{daikichi, false, response{200, "大吉"}},
+		{kyo, false, response{200, "凶"}},
+		{shokichi, true, response{200, "大吉"}},
+	}
+
+	for _, c := range cases {
+		fetchKujiFunc = func() string {
+			return c.luck
+		}
+		isNewYearsHolidayFunc = func() bool {
+			return c.isNewYearsHoliday
+		}
+
+		res, err := http.Get(ts.URL)
+
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		body, err := ioutil.ReadAll(res.Body)
+
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if res.StatusCode != 200 {
+			t.Errorf("expedted status %v, but returned %v", c.expected, 200)
+		}
+
+		var actual response
+		json.Unmarshal(body, &actual)
+
+		if actual != c.expected {
+			t.Errorf("expedted %v, but returned %v", c.expected, actual)
+		}
+	}
+}