diff --git a/.env.example b/.env.example
index e9f330d..88325ce 100644
--- a/.env.example
+++ b/.env.example
@@ -1,3 +1,5 @@
+POSTGRES_URL="postgres://user:pass@localhost:5432/test"
+
 REDIS_ADDRESS="localhost:16379"
 
 IMGPROXY_URL="http://localhost:18080"
diff --git a/go.mod b/go.mod
index 3987194..73c30cf 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@ module otomadb.com/images
 go 1.21.1
 
 require (
+	github.com/jackc/pgx/v5 v5.4.3
 	github.com/labstack/echo/v4 v4.11.1
 	github.com/redis/go-redis/v9 v9.2.0
 )
@@ -11,6 +12,8 @@ require (
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/golang-jwt/jwt v3.2.2+incompatible // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
 	github.com/labstack/gommon v0.4.0 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.19 // indirect
diff --git a/go.sum b/go.sum
index 50bcd58..b93f3a5 100644
--- a/go.sum
+++ b/go.sum
@@ -11,6 +11,12 @@ github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/r
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
 github.com/golang-jwt/jwt v3.2.2+incompatible h1:IfV12K8xAKAnZqdXVzCZ+TOjboZ2keLg81eXfW3O+oY=
 github.com/golang-jwt/jwt v3.2.2+incompatible/go.mod h1:8pz2t5EyA70fFQQSrl6XZXzqecmYZeUEB8OUGHkxJ+I=
+github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
+github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
+github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a h1:bbPeKD0xmW/Y25WS6cokEszi5g+S0QxI/d45PkRi7Nk=
+github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
+github.com/jackc/pgx/v5 v5.4.3 h1:cxFyXhxlvAifxnkKKdlxv8XqUf59tDlYjnV5YYfsJJY=
+github.com/jackc/pgx/v5 v5.4.3/go.mod h1:Ig06C2Vu0t5qXC60W8sqIthScaEnFvojjj9dSljmHRA=
 github.com/labstack/echo/v4 v4.11.1 h1:dEpLU2FLg4UVmvCGPuk/APjlH6GDpbEPti61srUUUs4=
 github.com/labstack/echo/v4 v4.11.1/go.mod h1:YuYRTSM3CHs2ybfrL8Px48bO6BAnYIN4l8wSTMP6BDQ=
 github.com/labstack/gommon v0.4.0 h1:y7cvthEAEbU0yHOf4axH8ZG2NH8knB9iNSoTO8dyIk8=
@@ -27,6 +33,7 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/redis/go-redis/v9 v9.2.0 h1:zwMdX0A4eVzse46YN18QhuDiM4uf3JmkOB4VZrdt5uI=
 github.com/redis/go-redis/v9 v9.2.0/go.mod h1:hdY0cQFCN4fnSYT6TkisLufl/4W5UIXyv0b/CLO2V2M=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
diff --git a/mad_primary_thumbnail.go b/mad_primary_thumbnail.go
new file mode 100644
index 0000000..b5baa0a
--- /dev/null
+++ b/mad_primary_thumbnail.go
@@ -0,0 +1,80 @@
+package main
+
+import (
+	"encoding/base64"
+	"fmt"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/labstack/echo/v4"
+	"github.com/redis/go-redis/v9"
+)
+
+func MADPrimaryThumbnail(c echo.Context) error {
+	serial, err := strconv.Atoi(c.Param("serial"))
+	if err != nil {
+		c.Logger().Error(err)
+		return c.String(http.StatusBadRequest, "Bad request")
+	}
+
+	scale := c.FormValue("scale")
+	width, height, err := ParseScale(scale)
+	if err != nil {
+		return c.String(http.StatusBadRequest, err.Error())
+	}
+
+	rdb := redis.NewClient(&redis.Options{Addr: os.Getenv("REDIS_ADDRESS")})
+	defer rdb.Close()
+
+	// Redisにキャッシュがあればリダイレクト
+	redisKey := fmt.Sprintf("mad_primary_thumbnail_%d_%d_%d", serial, width, height)
+	cachedUrl, err := rdb.Get(ctx, redisKey).Result()
+	if err != nil && err != redis.Nil {
+		c.Logger().Error(err)
+		return c.String(http.StatusInternalServerError, "Internal Server Error")
+	}
+	if cachedUrl != "" {
+		return c.Redirect(http.StatusTemporaryRedirect, cachedUrl)
+	}
+
+	conn, err := pgx.Connect(ctx, os.Getenv("POSTGRES_URL"))
+	if err != nil {
+		c.Logger().Error(err)
+		c.String(http.StatusInternalServerError, "Internal Server Error")
+	}
+	defer conn.Close(ctx)
+
+	var url string
+	q := `SELECT t."imageUrl" FROM "VideoThumbnail" t JOIN "Video" v ON t."videoId" = v."id" WHERE v."serial" = $1 AND t."isPrimary" = TRUE`
+	err = conn.QueryRow(ctx, q, serial).Scan(&url)
+	if err != nil {
+		c.Logger().Error(err)
+		return c.String(http.StatusInternalServerError, "Internal Server Error")
+	}
+
+	// 画像の存在チェック
+	c.Logger().Debug(url)
+	resp, err := http.Head(url)
+	if err != nil {
+		return c.String(http.StatusInternalServerError, "Internal Server Error")
+	}
+	if resp.StatusCode != http.StatusOK {
+		c.Logger().Warn(url, resp.StatusCode)
+		return c.String(http.StatusNotFound, "Not Found")
+	}
+
+	proxiedUrl := SignURL(
+		fmt.Sprintf("/rs:fit:%d:%d:1:1/background:000000/%s", width, height, base64.URLEncoding.EncodeToString([]byte(url))))
+	c.Logger().Debug(proxiedUrl)
+
+	// Redisにキャッシュ
+	err = rdb.Set(ctx, redisKey, proxiedUrl, time.Duration(600*time.Second)).Err()
+	if err != nil {
+		c.Logger().Error(err)
+	}
+
+	return c.Redirect(http.StatusTemporaryRedirect, proxiedUrl)
+}
diff --git a/main.go b/main.go
index 6d2f84c..36bc5b2 100644
--- a/main.go
+++ b/main.go
@@ -14,6 +14,8 @@ func main() {
 	e.Debug = true
 	e.Use(middleware.Logger())
 
+	e.GET("/mads/:serial/primary", MADPrimaryThumbnail)
+
 	e.GET("/original/youtube/:vid", OriginalYoutubeThumbnail)
 	e.GET("/original/nicovideo/:vid", OriginalNicovideoThumbnail)
 	e.GET("/original/bilibili/:vid", OriginalBilibiliThumbnail)
diff --git a/misc.go b/misc.go
index f9cc80a..8ac5e01 100644
--- a/misc.go
+++ b/misc.go
@@ -20,3 +20,14 @@ func ParseSize(size string) (width, height int, err error) {
 
 	return width, height, nil
 }
+
+func ParseScale(scale string) (width, height int, err error) {
+	switch scale {
+	case "ogp":
+		return 700, 400, nil
+	case "large":
+		return 960, 720, nil
+	default:
+		return 0, 0, fmt.Errorf("invalid scale")
+	}
+}