diff --git a/kadai4/pei/Makefile b/kadai4/pei/Makefile
new file mode 100644
index 0000000..011a05d
--- /dev/null
+++ b/kadai4/pei/Makefile
@@ -0,0 +1,17 @@
+ROOT=github.com/gopherdojo/dojo6/kadai4/pei
+BIN=fortune
+MAIN=main.go
+TEST=...
+
+.PHONY: build
+build: ${MAIN}
+	go build -o ${BIN} ${GOPATH}/src/${ROOT}/$?
+
+.PHONY: test
+test:
+	go test -v -cover ${ROOT}/${TEST}
+
+.PHONY: clean
+clean:
+	rm ${BIN}
+	go clean
diff --git a/kadai4/pei/README.md b/kadai4/pei/README.md
new file mode 100644
index 0000000..0b12fe7
--- /dev/null
+++ b/kadai4/pei/README.md
@@ -0,0 +1,5 @@
+## 課題4 おみくじAPIを作ってみよう
+
+- JSON形式でおみくじの結果を返す
+- 正月（1/1-1/3）だけ大吉にする
+- ハンドラのテストを書いてみる
diff --git a/kadai4/pei/main.go b/kadai4/pei/main.go
new file mode 100644
index 0000000..f12a73c
--- /dev/null
+++ b/kadai4/pei/main.go
@@ -0,0 +1,22 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net/http"
+
+	"github.com/gopherdojo/dojo6/kadai4/pei/pkg/fortune"
+)
+
+var port int
+
+func init() {
+	flag.IntVar(&port, "p", 8080, "server port")	
+}
+
+func main() {
+	flag.Parse()
+	f := fortune.NewFortune(fortune.DefaultClock{})
+	http.HandleFunc("/", f.Handler)
+	http.ListenAndServe(fmt.Sprintf(":%d", port), nil)
+}
diff --git a/kadai4/pei/pkg/fortune/fortune.go b/kadai4/pei/pkg/fortune/fortune.go
new file mode 100644
index 0000000..bb3d927
--- /dev/null
+++ b/kadai4/pei/pkg/fortune/fortune.go
@@ -0,0 +1,88 @@
+package fortune
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"math/rand"
+	"net/http"
+	"time"
+)
+
+var fortuneList = []string{
+	"大吉",
+	"中吉",
+	"吉",
+	"小吉",
+	"凶",
+}
+
+// Clock
+type Clock interface {
+	GetCurrentTime() time.Time
+}
+
+// DefaultClock
+type DefaultClock struct{}
+
+// Fortune
+type Fortune struct {
+	clock Clock
+}
+
+// DrawingResult
+type DrawingResult struct {
+	Result string `json:"result"`
+}
+
+func init() {
+	rand.Seed(time.Now().UnixNano())
+}
+
+// GetCurrentTime return current time
+func (d DefaultClock) GetCurrentTime() time.Time {
+	return time.Now()
+}
+
+// NewFortune return fortune instance
+func NewFortune(c Clock) * Fortune {
+	return &Fortune{clock: c}
+}
+
+func (f Fortune) drawingForNewYearDay() string {
+	return "大吉"
+}
+
+func (f Fortune) defaultDrawing() string {
+	return fortuneList[rand.Intn(len(fortuneList))]
+}
+
+func (f Fortune) isNewYearDay() bool {
+	c := f.clock.GetCurrentTime()
+
+	return c.Month() == 1 && 1 <= c.Day() && c.Day() <= 3
+}
+
+// Drawing return drawing result
+func (f Fortune) Drawing() string {
+	if f.isNewYearDay() {
+		return f.drawingForNewYearDay()
+	}
+	return f.defaultDrawing()
+}
+
+// GetFortuneList return fortuneList
+func (f Fortune) GetFortuneList() []string {
+	return fortuneList
+}
+
+// Handler
+func (f Fortune) Handler(w http.ResponseWriter, r *http.Request) {
+	var buf bytes.Buffer
+	dr := DrawingResult{Result: f.Drawing()}
+	enc := json.NewEncoder(&buf)
+	if err := enc.Encode(dr); err != nil {
+		fmt.Errorf("error: %v", err)
+	}
+	fmt.Fprint(w, buf.String())
+}
diff --git a/kadai4/pei/pkg/fortune/fortune_test.go b/kadai4/pei/pkg/fortune/fortune_test.go
new file mode 100644
index 0000000..96362e6
--- /dev/null
+++ b/kadai4/pei/pkg/fortune/fortune_test.go
@@ -0,0 +1,73 @@
+package fortune_test
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/gopherdojo/dojo6/kadai4/pei/pkg/fortune"
+)
+
+func TestFortune_Handler(t *testing.T) {
+	f := fortune.NewFortune(fortune.DefaultClock{})
+	w := httptest.NewRecorder()
+	r := httptest.NewRequest("GET", "/", nil)
+	f.Handler(w, r)
+
+	rw := w.Result()
+	defer rw.Body.Close()
+	if rw.StatusCode != http.StatusOK {
+		t.Error("unexpected status code")
+	}
+
+	b, err := ioutil.ReadAll(rw.Body)
+	if err != nil {
+		t.Error("unexpected error")
+	}
+
+	dr := &fortune.DrawingResult{}
+	if err := json.Unmarshal(b, &dr); err != nil {
+		t.Error("failed json unmarshal")
+	}
+
+	fortuneList := f.GetFortuneList()
+	contain := false
+	for _, v := range fortuneList {
+		if v == dr.Result {
+			contain = true
+			break
+		}
+	}
+
+	if !contain {
+		t.Errorf("unexpected response: %s", string(b))
+	}
+}
+
+type MockClock struct {
+	currentTime time.Time
+}
+
+func (mc MockClock) GetCurrentTime() time.Time {
+	return mc.currentTime
+}
+
+func TestFortune_Drawing(t *testing.T) {
+	cases := []struct {
+		clock time.Time
+	}{
+		{time.Date(2019, 1, 1, 0, 0, 0, 0, time.UTC)},
+		{time.Date(2019, 1, 3, 23, 59, 59, 0, time.UTC)},
+	}
+
+	for _, c := range cases {
+		mc := &MockClock{c.clock}
+		f := fortune.NewFortune(mc)
+		if actual := f.Drawing(); actual != "大吉" {
+			t.Errorf("unexpected result: %s on %v", actual, mc.GetCurrentTime())
+		}
+	}
+}