diff --git a/kadai4/matsuki/lib/entities.go b/kadai4/matsuki/lib/entities.go
new file mode 100644
index 0000000..b8ff12c
--- /dev/null
+++ b/kadai4/matsuki/lib/entities.go
@@ -0,0 +1,38 @@
+package lib
+
+import (
+	"time"
+)
+
+// FortuneResult は、おみくじを引いた結果
+// - JSON返却値
+type FortuneResult struct {
+	Today         jsonTime `json:"today"`
+	Fortune       string   `json:"fortune"`
+	IsNewyearMode bool     `json:"is_newyear_mode"`
+}
+
+// 独自のjsonTimeを作成
+// - https://qiita.com/taizo/items/2c3a338f1aeea86ce9e2
+type jsonTime struct {
+	time.Time
+}
+
+func (j jsonTime) format() string {
+	return j.Time.Format("2006-01-02")
+}
+func (j jsonTime) parse(value string) (time.Time, error) {
+	return time.Parse(`"2006-01-02"`, value)
+}
+
+// MarshalJSON() の実装
+func (j jsonTime) MarshalJSON() ([]byte, error) {
+	return []byte(`"` + j.format() + `"`), nil
+}
+
+// UnmarshalJSON() の実装
+func (j jsonTime) UnmarshalJSON(data []byte) error {
+	tm, err := j.parse(string(data))
+	j.Time = tm
+	return err
+}
diff --git a/kadai4/matsuki/lib/fortune.go b/kadai4/matsuki/lib/fortune.go
new file mode 100644
index 0000000..46429d4
--- /dev/null
+++ b/kadai4/matsuki/lib/fortune.go
@@ -0,0 +1,62 @@
+package lib
+
+import (
+	"log"
+	"math/rand"
+	"time"
+)
+
+// Verbos は、ログ出力レベルを制御
+var Verbos bool
+
+// Fortune は、おみくじに関する型
+type Fortune struct {
+	fortuneList map[uint]string
+	luckiest    string
+	today       time.Time
+}
+
+// NewFortune は、おみくじの初期化
+func NewFortune(now time.Time) Fortune {
+	// おみくじのタネを初期化
+	rand.Seed(time.Now().UnixNano())
+
+	return Fortune{
+		fortuneList: map[uint]string{
+			0: "大吉",
+			1: "中吉",
+			2: "吉",
+			3: "凶",
+			4: "大凶",
+		},
+		luckiest: "大吉",
+		today:    now,
+	}
+}
+
+func (f Fortune) isNewyearsDay() bool {
+	if Verbos {
+		log.Printf("[DEBUG] today is %v %v", f.today.Day(), f.today.Month())
+	}
+
+	// Month is defined here:  https://golang.org/pkg/time/#Month
+	if f.today.Month().String() == "January" {
+		switch f.today.Day() {
+		case 1, 2, 3:
+			return true
+		}
+	}
+	return false
+}
+
+// DrawFortuneSlip は、おみくじを引く関数
+//  return ( 運勢, is正月 )
+func (f Fortune) DrawFortuneSlip() (string, bool) {
+	// 正月には大吉を引く
+	if f.isNewyearsDay() {
+		return f.luckiest, true
+	}
+	// 等確率でひく
+	r := rand.Intn(len(f.fortuneList))
+	return f.fortuneList[uint(r)], false
+}
diff --git a/kadai4/matsuki/lib/fortune_test.go b/kadai4/matsuki/lib/fortune_test.go
new file mode 100644
index 0000000..77c6ced
--- /dev/null
+++ b/kadai4/matsuki/lib/fortune_test.go
@@ -0,0 +1,56 @@
+package lib
+
+import (
+	"log"
+	"math/rand"
+	"testing"
+	"time"
+
+	"github.com/gopherdojo/dojo1/kadai4/matsuki/lib"
+)
+
+// TestMain called first
+func TestMain(t *testing.T) {
+
+	beforeTest()
+
+	// test here
+	// TestIndex(t)
+
+}
+
+func beforeTest() {
+	rand.Seed(time.Now().UnixNano())
+	lib.Verbos = true
+}
+
+func TestDrawFortuneSlip(t *testing.T) {
+	f := lib.NewFortune(time.Now())
+	slip, _ := f.DrawFortuneSlip()
+	switch slip {
+	case "大吉", "中吉", "吉", "凶", "大凶":
+		log.Print("draw valid slip")
+	default:
+		t.Errorf("invalid slip=%v", slip)
+	}
+}
+
+func TestDrawWhenNewyear(t *testing.T) {
+	tm, err := time.Parse("2006-01-02", "2013-01-03")
+	log.Println("test date=", tm, err)
+
+	f := lib.NewFortune(tm)
+	slip, isNd := f.DrawFortuneSlip()
+	switch slip {
+	case "大吉":
+		log.Print("draw valid slip")
+	case "中吉", "吉", "凶", "大凶":
+		t.Errorf("today is newYear. invalid slip=%v", slip)
+	default:
+		t.Errorf("invalid slip=%v", slip)
+	}
+
+	if isNd != true {
+		t.Errorf("want isNewYearDay is true but %v", isNd)
+	}
+}
diff --git a/kadai4/matsuki/lib/server.go b/kadai4/matsuki/lib/server.go
new file mode 100644
index 0000000..a481945
--- /dev/null
+++ b/kadai4/matsuki/lib/server.go
@@ -0,0 +1,81 @@
+package lib
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+	"time"
+)
+
+var drawer Drawer
+
+// Drawer は、おみくじを引くinterface
+type Drawer interface {
+	DrawFortuneSlip() (string, bool)
+}
+
+// NewServer is constoructor
+//  Drawer interfaceを使うことでunitTestしやすくする
+func NewServer(d Drawer) http.Server {
+	SetDrawer(d) // パッケージ内部グローバル変数にセット
+
+	m := http.NewServeMux()
+	// Routing
+	m.Handle("/twice", http.HandlerFunc(Twice))
+	m.Handle("/", http.HandlerFunc(Index))
+
+	server := http.Server{
+		Addr:    ":8080",
+		Handler: m,
+	}
+	log.Printf("[INFO] server start")
+	return server
+}
+
+// SetDrawer is setter
+func SetDrawer(d Drawer) {
+	drawer = d
+}
+
+// Index では、おみくじを引き、結果をJSONで返却
+func Index(w http.ResponseWriter, req *http.Request) {
+	if req.URL.Path != "/" {
+		log.Printf("[INFO] index() with path = %v", req.URL.Path)
+		http.NotFound(w, req)
+		return
+	}
+
+	fortuneRes, isNewyearDay := drawer.DrawFortuneSlip()
+	log.Printf("[INFO] index() with fourtune=%v, isNewyearDay=%v", fortuneRes, isNewyearDay)
+	// w.Write([]byte("Hello world = " + fortuneRes))
+	res := FortuneResult{
+		Today:         jsonTime{time.Now()},
+		Fortune:       fortuneRes,
+		IsNewyearMode: isNewyearDay,
+	}
+	if err := json.NewEncoder(w).Encode(res); err != nil {
+		panic(err)
+	}
+}
+
+// Twice では、おみくじを２回連続で引き、JSONで返却
+func Twice(w http.ResponseWriter, req *http.Request) {
+	fFirst, isNdFist := drawer.DrawFortuneSlip()
+	fSecond, isNdSecond := drawer.DrawFortuneSlip()
+
+	res := []FortuneResult{
+		FortuneResult{
+			Today:         jsonTime{time.Now()},
+			Fortune:       fFirst,
+			IsNewyearMode: isNdFist,
+		},
+		FortuneResult{
+			Today:         jsonTime{time.Now()},
+			Fortune:       fSecond,
+			IsNewyearMode: isNdSecond,
+		},
+	}
+	if err := json.NewEncoder(w).Encode(res); err != nil {
+		panic(err)
+	}
+}
diff --git a/kadai4/matsuki/lib/server_test.go b/kadai4/matsuki/lib/server_test.go
new file mode 100644
index 0000000..8107e04
--- /dev/null
+++ b/kadai4/matsuki/lib/server_test.go
@@ -0,0 +1,94 @@
+package lib
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gopherdojo/dojo1/kadai4/matsuki/lib"
+)
+
+type MockDrawer struct {
+}
+
+// DrawFortuneSlip is Mock
+func (m MockDrawer) DrawFortuneSlip() (string, bool) {
+	return "大吉", false
+}
+
+// TestMain called first
+func TestMain(t *testing.T) {
+
+	beforeTest()
+
+	// test here
+	// TestIndex(t)
+
+}
+
+func beforeTest() {
+	lib.SetDrawer(MockDrawer{})
+}
+
+func TestIndex(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(lib.Index))
+	defer ts.Close()
+
+	res, err := http.Get(ts.URL)
+	if err != nil {
+		t.Error("unexpected")
+		return
+	}
+
+	if res.StatusCode != 200 {
+		t.Error("Status code error")
+		return
+	}
+
+	//レスポンスBODY取得
+	body, _ := ioutil.ReadAll(res.Body)
+	have := string(body)
+	log.Print(have)
+
+	fortuneRes := lib.FortuneResult{}
+	if err := json.Unmarshal([]byte(have), &fortuneRes); err != nil {
+		t.Errorf("response body cannot unmarshal. err=%v, body=%v", err, have)
+	}
+
+	// now := time.Now()
+	// today := now.Format("2006-01-02")
+	// want := fmt.Sprint(`{"today":"`, today, `","fortune":"大吉","is_newyear_mode":false}`)
+	//
+	// if have != want {
+	// 	t.Errorf("response body error, want %v but have %v", want, have)
+	// }
+}
+
+func TestTwice(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(lib.Twice))
+	defer ts.Close()
+
+	res, err := http.Get(ts.URL)
+	if err != nil {
+		t.Error("unexpected")
+		return
+	}
+
+	if res.StatusCode != 200 {
+		t.Error("Status code error")
+		return
+	}
+
+	//レスポンスBODY取得 & JSON復元できるか
+	body, _ := ioutil.ReadAll(res.Body)
+	have := string(body)
+	log.Print(have)
+
+	fortuneRess := []lib.FortuneResult{}
+	if err := json.Unmarshal([]byte(have), &fortuneRess); err != nil {
+		t.Errorf("response body cannot unmarshal. err=%v, body=%v", err, have)
+	}
+}
diff --git a/kadai4/matsuki/main.go b/kadai4/matsuki/main.go
new file mode 100644
index 0000000..0c89e85
--- /dev/null
+++ b/kadai4/matsuki/main.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	"time"
+
+	"github.com/gopherdojo/dojo1/kadai4/matsuki/lib"
+)
+
+var verbos bool
+
+func main() {
+	lib.Verbos = true
+
+	f := lib.NewFortune(time.Now())
+	// server
+	s := lib.NewServer(f)
+	s.ListenAndServe()
+}