diff --git a/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/check_duplicate/.mcfunction b/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/check_duplicate/.mcfunction
new file mode 100644
index 0000000000..fbea3ce343
--- /dev/null
+++ b/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/check_duplicate/.mcfunction
@@ -0,0 +1,15 @@
+#> asset:mob/2002.duplicate_hit_protection_mixin/check_duplicate/
+#
+# 継承先などから実行される処理
+#
+# @within asset:mob/alias/2002/check_duplicate
+
+scoreboard players reset @s 2002.DuplicateHitProtectionMixin
+
+execute if entity @s[type= player] store result storage asset:temp Args.ID int 1 run scoreboard players get @s UserID
+execute if entity @s[type=!player,tag=!ExtendedCollision] store result storage asset:temp Args.ID int 1 run scoreboard players get @s MobUUID
+execute if entity @s[tag= ExtendedCollision] store result storage asset:temp Args.ID int 1 run scoreboard players get @s ForwardTargetMobUUID
+
+execute if entity @s[type= player] run function asset:mob/2002.duplicate_hit_protection_mixin/check_duplicate/check_first_hit/player.m with storage asset:temp Args
+execute if entity @s[type=!player] run function asset:mob/2002.duplicate_hit_protection_mixin/check_duplicate/check_first_hit/non-player.m with storage asset:temp Args
+data remove storage asset:temp Args
diff --git a/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/check_duplicate/check_first_hit/non-player.m.mcfunction b/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/check_duplicate/check_first_hit/non-player.m.mcfunction
new file mode 100644
index 0000000000..a88ab6c5d7
--- /dev/null
+++ b/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/check_duplicate/check_first_hit/non-player.m.mcfunction
@@ -0,0 +1,9 @@
+#> asset:mob/2002.duplicate_hit_protection_mixin/check_duplicate/check_first_hit/non-player.m
+#
+#
+#
+# @within function asset:mob/2002.duplicate_hit_protection_mixin/check_duplicate/
+
+$execute unless data storage asset:context this.DuplicateHitProtectForNonPlayer.$(ID) run scoreboard players set @s 2002.DuplicateHitProtectionMixin 1
+
+$execute unless data storage asset:context this.DuplicateHitProtectForNonPlayer.$(ID) run data modify storage asset:context this.DuplicateHitProtectForNonPlayer.$(ID) set value true
diff --git a/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/check_duplicate/check_first_hit/player.m.mcfunction b/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/check_duplicate/check_first_hit/player.m.mcfunction
new file mode 100644
index 0000000000..bcea56cf25
--- /dev/null
+++ b/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/check_duplicate/check_first_hit/player.m.mcfunction
@@ -0,0 +1,9 @@
+#> asset:mob/2002.duplicate_hit_protection_mixin/check_duplicate/check_first_hit/player.m
+#
+#
+#
+# @within function asset:mob/2002.duplicate_hit_protection_mixin/check_duplicate/
+
+$execute unless data storage asset:context this.DuplicateHitProtectForPlayer.$(ID) run scoreboard players set @s 2002.DuplicateHitProtectionMixin 1
+
+$execute unless data storage asset:context this.DuplicateHitProtectForPlayer.$(ID) run data modify storage asset:context this.DuplicateHitProtectForPlayer.$(ID) set value true
diff --git a/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/load.mcfunction b/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/load.mcfunction
new file mode 100644
index 0000000000..3bf0580641
--- /dev/null
+++ b/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/load.mcfunction
@@ -0,0 +1,9 @@
+#> asset:mob/2002.duplicate_hit_protection_mixin/load
+#
+# Mobに利用するスコアボード等の初期化処理
+#
+# @within tag/function asset:mob/load
+
+#> 定義類はここに
+# @within asset:mob/2002.duplicate_hit_protection_mixin/**
+    scoreboard objectives add 2002.DuplicateHitProtectionMixin dummy
diff --git a/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/register.mcfunction b/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/register.mcfunction
new file mode 100644
index 0000000000..1b8dccedfa
--- /dev/null
+++ b/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/register.mcfunction
@@ -0,0 +1,26 @@
+#> asset:mob/2002.duplicate_hit_protection_mixin/register
+#
+# Mobのデータを指定
+#
+# @within function asset:mob/alias/2002/register
+
+# 他のモブに継承されることを許可するか (boolean) (オプション)
+    data modify storage asset:mob ExtendsSafe set value true
+# 継承されることを前提とした、抽象的なモブであるかどうか(boolean)
+    data modify storage asset:mob IsAbstract set value true
+# ID (int)
+    data modify storage asset:mob ID set value 2002
+# フィールド(オプション)
+    data modify storage asset:mob Field.DuplicateHitProtectForPlayer set value {}
+    data modify storage asset:mob Field.DuplicateHitProtectForNonPlayer set value {}
+
+# How to use
+# data modify storage api: Argument.Damage set value ...
+# data modify storage api: Argument.AttackType set value ...
+# data modify storage api: Argument.ElementType set value ...
+# execute ... run function api:damage/modifier
+# execute as @e[type=#lib:living_without_player,tag=Enemy,tag=!Uninterferable,distance=..50] run function {
+#   function asset:mob/call.m {method:"check_duplicate"}
+#   execute if predicate asset:mob/2002.duplicate_hit_protection_mixin/is_first_hit run function api:damage/
+# }
+# function api:damage/reset
diff --git a/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/reset_duplicate_protection/.mcfunction b/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/reset_duplicate_protection/.mcfunction
new file mode 100644
index 0000000000..8506a4d205
--- /dev/null
+++ b/Asset/data/asset/functions/mob/2002.duplicate_hit_protection_mixin/reset_duplicate_protection/.mcfunction
@@ -0,0 +1,8 @@
+#> asset:mob/2002.duplicate_hit_protection_mixin/reset_duplicate_protection/
+#
+# 継承先などから実行される処理
+#
+# @within asset:mob/alias/2002/reset_duplicate_protection
+
+data modify storage asset:context this.DuplicateHitProtectForPlayer set value {}
+data modify storage asset:context this.DuplicateHitProtectForNonPlayer set value {}
diff --git a/Asset/data/asset/functions/mob/alias/2002/check_duplicate.mcfunction b/Asset/data/asset/functions/mob/alias/2002/check_duplicate.mcfunction
new file mode 100644
index 0000000000..892d54f983
--- /dev/null
+++ b/Asset/data/asset/functions/mob/alias/2002/check_duplicate.mcfunction
@@ -0,0 +1,8 @@
+#> asset:mob/alias/2002/check_duplicate
+#
+# メソッド処理のエイリアス
+#
+# @within asset_manager:mob/triggers/call_method/run_method.m
+
+# 本来の処理を呼び出す
+    function asset:mob/2002.duplicate_hit_protection_mixin/check_duplicate/
\ No newline at end of file
diff --git a/Asset/data/asset/functions/mob/alias/2002/register.mcfunction b/Asset/data/asset/functions/mob/alias/2002/register.mcfunction
new file mode 100644
index 0000000000..5eb9a2d45d
--- /dev/null
+++ b/Asset/data/asset/functions/mob/alias/2002/register.mcfunction
@@ -0,0 +1,8 @@
+#> asset:mob/alias/2002/register
+#
+# Mobのデータ指定処理のエイリアス
+#
+# @within asset_manager:mob/triggers/summon/register.m
+
+# 元の登録処理を呼び出す
+   function asset:mob/2002.duplicate_hit_protection_mixin/register
\ No newline at end of file
diff --git a/Asset/data/asset/functions/mob/alias/2002/reset_duplicate_protection.mcfunction b/Asset/data/asset/functions/mob/alias/2002/reset_duplicate_protection.mcfunction
new file mode 100644
index 0000000000..f8022f21d9
--- /dev/null
+++ b/Asset/data/asset/functions/mob/alias/2002/reset_duplicate_protection.mcfunction
@@ -0,0 +1,8 @@
+#> asset:mob/alias/2002/reset_duplicate_protection
+#
+# メソッド処理のエイリアス
+#
+# @within asset_manager:mob/triggers/call_method/run_method.m
+
+# 本来の処理を呼び出す
+    function asset:mob/2002.duplicate_hit_protection_mixin/reset_duplicate_protection/
\ No newline at end of file
diff --git a/Asset/data/asset/predicates/mob/2002.duplicate_hit_protection_mixin/is_first_hit.json b/Asset/data/asset/predicates/mob/2002.duplicate_hit_protection_mixin/is_first_hit.json
new file mode 100644
index 0000000000..d3f428f421
--- /dev/null
+++ b/Asset/data/asset/predicates/mob/2002.duplicate_hit_protection_mixin/is_first_hit.json
@@ -0,0 +1,10 @@
+{
+    "condition": "entity_scores",
+    "entity": "this",
+    "scores": {
+        "2002.DuplicateHitProtectionMixin": {
+            "min": 1,
+            "max": 1
+        }
+    }
+}
diff --git a/Asset/data/asset/tags/functions/mob/load.json b/Asset/data/asset/tags/functions/mob/load.json
index c7c1c9d582..66b4dbeede 100644
--- a/Asset/data/asset/tags/functions/mob/load.json
+++ b/Asset/data/asset/tags/functions/mob/load.json
@@ -1,5 +1,6 @@
 {
     "values": [
+        "asset:mob/2002.duplicate_hit_protection_mixin/load",
         "asset:mob/0437.lawless_iron_doll/load",
         "asset:mob/0301.karmic/load",
         "asset:mob/0365.frestchika/load",
@@ -59,4 +60,4 @@
         "asset:mob/0081.snow_cloud/load",
         "asset:mob/0139.blast_eye/0.load"
     ]
-}
+}
\ No newline at end of file