diff --git a/jp/4/battle-01.md b/jp/4/battle-01.md
index 83b71f46e0..fcb44de37a 100644
--- a/jp/4/battle-01.md
+++ b/jp/4/battle-01.md
@@ -202,7 +202,7 @@ material:
 
       import "./zombiehelper.sol";
 
-      contract ZombieBattle is ZombieHelper {
+      contract ZombieAttack is ZombieHelper {
 
       }
 ---
@@ -221,4 +221,4 @@ payable関数とコントラクトの残高について学習してきたが、
 
 2. `zombiehelper.sol`を`import`せよ。
 
-3. `ZombieBattle`という名の新規`contract`を宣言せよ。これは`ZombieHelper`を継承する。コントラクト本文は、今はまだ空のままにしておくのだ。
+3. `ZombieAttack`という名の新規`contract`を宣言せよ。これは`ZombieHelper`を継承する。コントラクト本文は、今はまだ空のままにしておくのだ。
diff --git a/jp/4/battle-02.md b/jp/4/battle-02.md
index 1c39a60a66..bc73b617a5 100644
--- a/jp/4/battle-02.md
+++ b/jp/4/battle-02.md
@@ -9,7 +9,7 @@ material:
       "zombieattack.sol": |
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           // ここから始めるのだ
         }
       "zombiehelper.sol": |
@@ -205,7 +205,7 @@ material:
     answer: >
       import "./zombiehelper.sol";
 
-      contract ZombieBattle is ZombieHelper {
+      contract ZombieAttack is ZombieHelper {
         uint randNonce = 0;
 
         function randMod(uint _modulus) internal returns(uint) {
diff --git a/jp/4/battle-03.md b/jp/4/battle-03.md
index 9f60cafa86..6b3ca1f642 100644
--- a/jp/4/battle-03.md
+++ b/jp/4/battle-03.md
@@ -9,7 +9,7 @@ material:
       "zombieattack.sol": |
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           // ここにattackVictoryProbabilityを作成せよ
 
@@ -213,7 +213,7 @@ material:
     answer: >
       import "./zombiehelper.sol";
 
-      contract ZombieBattle is ZombieHelper {
+      contract ZombieAttack is ZombieHelper {
         uint randNonce = 0;
         uint attackVictoryProbability = 70;
 
diff --git a/jp/4/battle-04.md b/jp/4/battle-04.md
index 5f52ec0a2c..4b3955554e 100644
--- a/jp/4/battle-04.md
+++ b/jp/4/battle-04.md
@@ -68,7 +68,7 @@ material:
       "zombieattack.sol": |
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/4/battle-05.md b/jp/4/battle-05.md
index fa36727052..c4ca9463ae 100644
--- a/jp/4/battle-05.md
+++ b/jp/4/battle-05.md
@@ -56,7 +56,7 @@ material:
       "zombieattack.sol": |
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/4/battle-06.md b/jp/4/battle-06.md
index f550a9b367..168808f4ee 100644
--- a/jp/4/battle-06.md
+++ b/jp/4/battle-06.md
@@ -9,7 +9,7 @@ material:
       "zombieattack.sol": |
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
@@ -213,7 +213,7 @@ material:
     answer: >
       import "./zombiehelper.sol";
 
-      contract ZombieBattle is ZombieHelper {
+      contract ZombieAttack is ZombieHelper {
         uint randNonce = 0;
         uint attackVictoryProbability = 70;
 
diff --git a/jp/4/battle-07.md b/jp/4/battle-07.md
index a8698cc3ee..6e0d6ae042 100644
--- a/jp/4/battle-07.md
+++ b/jp/4/battle-07.md
@@ -56,7 +56,7 @@ material:
       "zombieattack.sol": |
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/4/battle-08.md b/jp/4/battle-08.md
index 7b48a41dd7..ba41789fad 100644
--- a/jp/4/battle-08.md
+++ b/jp/4/battle-08.md
@@ -9,7 +9,7 @@ material:
       "zombieattack.sol": |
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
@@ -217,7 +217,7 @@ material:
     answer: >
       import "./zombiehelper.sol";
 
-      contract ZombieBattle is ZombieHelper {
+      contract ZombieAttack is ZombieHelper {
         uint randNonce = 0;
         uint attackVictoryProbability = 70;
 
diff --git a/jp/4/battle-09.md b/jp/4/battle-09.md
index c35f78bc1c..87b29253e9 100644
--- a/jp/4/battle-09.md
+++ b/jp/4/battle-09.md
@@ -9,7 +9,7 @@ material:
       "zombieattack.sol": |
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
@@ -222,7 +222,7 @@ material:
     answer: >
       import "./zombiehelper.sol";
 
-      contract ZombieBattle is ZombieHelper {
+      contract ZombieAttack is ZombieHelper {
         uint randNonce = 0;
         uint attackVictoryProbability = 70;
 
diff --git a/jp/5/01-erc721-1.md b/jp/5/01-erc721-1.md
index 167242af4a..40840ef1de 100644
--- a/jp/5/01-erc721-1.md
+++ b/jp/5/01-erc721-1.md
@@ -13,7 +13,7 @@ material:
 
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/5/02-erc721-2.md b/jp/5/02-erc721-2.md
index 1a7a17f631..949cbcfe61 100644
--- a/jp/5/02-erc721-2.md
+++ b/jp/5/02-erc721-2.md
@@ -21,7 +21,7 @@ material:
 
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/5/03-erc721-3.md b/jp/5/03-erc721-3.md
index e3909ddcc1..e77d401f7f 100644
--- a/jp/5/03-erc721-3.md
+++ b/jp/5/03-erc721-3.md
@@ -39,7 +39,7 @@ material:
 
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/5/04-erc721-4.md b/jp/5/04-erc721-4.md
index aae62b0b60..2dbd56dbf1 100644
--- a/jp/5/04-erc721-4.md
+++ b/jp/5/04-erc721-4.md
@@ -100,7 +100,7 @@ material:
 
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/5/05-erc721-5.md b/jp/5/05-erc721-5.md
index d4e018672a..6a1e0f9c21 100644
--- a/jp/5/05-erc721-5.md
+++ b/jp/5/05-erc721-5.md
@@ -41,7 +41,7 @@ material:
 
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/5/06-erc721-6.md b/jp/5/06-erc721-6.md
index bd11478eb4..edbd8722ac 100644
--- a/jp/5/06-erc721-6.md
+++ b/jp/5/06-erc721-6.md
@@ -47,7 +47,7 @@ material:
 
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/5/07-erc721-7.md b/jp/5/07-erc721-7.md
index 9c426975d3..e1dc97ad8c 100644
--- a/jp/5/07-erc721-7.md
+++ b/jp/5/07-erc721-7.md
@@ -49,7 +49,7 @@ material:
 
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/5/08-erc721-8.md b/jp/5/08-erc721-8.md
index d257252dd3..6bf8c04f0e 100644
--- a/jp/5/08-erc721-8.md
+++ b/jp/5/08-erc721-8.md
@@ -49,7 +49,7 @@ material:
 
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/5/09-safemath-1.md b/jp/5/09-safemath-1.md
index 53102d5150..1856d521cd 100644
--- a/jp/5/09-safemath-1.md
+++ b/jp/5/09-safemath-1.md
@@ -101,7 +101,7 @@ material:
 
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/5/10-safemath-2.md b/jp/5/10-safemath-2.md
index 9f5f59daca..63ae4271b8 100644
--- a/jp/5/10-safemath-2.md
+++ b/jp/5/10-safemath-2.md
@@ -56,7 +56,7 @@ material:
 
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/5/11-safemath-3.md b/jp/5/11-safemath-3.md
index 0ebf5b314f..d55f52780e 100644
--- a/jp/5/11-safemath-3.md
+++ b/jp/5/11-safemath-3.md
@@ -109,7 +109,7 @@ material:
 
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
diff --git a/jp/5/12-safemath-4.md b/jp/5/12-safemath-4.md
index b493e7d73b..da2cb7c919 100644
--- a/jp/5/12-safemath-4.md
+++ b/jp/5/12-safemath-4.md
@@ -11,7 +11,7 @@ material:
 
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;
 
@@ -345,7 +345,7 @@ material:
 
       import "./zombiehelper.sol";
 
-      contract ZombieBattle is ZombieHelper {
+      contract ZombieAttack is ZombieHelper {
         uint randNonce = 0;
         uint attackVictoryProbability = 70;
 
diff --git a/jp/5/13-comments.md b/jp/5/13-comments.md
index 73a4244d1e..92abb84a7a 100644
--- a/jp/5/13-comments.md
+++ b/jp/5/13-comments.md
@@ -55,7 +55,7 @@ material:
 
         import "./zombiehelper.sol";
 
-        contract ZombieBattle is ZombieHelper {
+        contract ZombieAttack is ZombieHelper {
           uint randNonce = 0;
           uint attackVictoryProbability = 70;