diff --git a/lib/bcdice/game_system.rb b/lib/bcdice/game_system.rb
index 7bfaa1c16..e3f111c88 100644
--- a/lib/bcdice/game_system.rb
+++ b/lib/bcdice/game_system.rb
@@ -180,6 +180,7 @@
 require "bcdice/game_system/MorkBorg"
 require "bcdice/game_system/Nechronica"
 require "bcdice/game_system/Nechronica_Korean"
+require "bcdice/game_system/NegikureNegimaki"
 require "bcdice/game_system/NeonUnderRealm"
 require "bcdice/game_system/NervWhitePaper"
 require "bcdice/game_system/NeverCloud"
diff --git a/lib/bcdice/game_system/NegikureNegimaki.rb b/lib/bcdice/game_system/NegikureNegimaki.rb
new file mode 100644
index 000000000..685c8895d
--- /dev/null
+++ b/lib/bcdice/game_system/NegikureNegimaki.rb
@@ -0,0 +1,139 @@
+# frozen_string_literal: true
+
+module BCDice
+  module GameSystem
+    class NegikureNegimaki < Base
+      # ゲームシステムの識別子
+      ID = "NegikureNegimaki"
+
+      # ゲームシステム名
+      NAME = "ネジクレネジマキ"
+
+      # ゲームシステム名の読みがな
+      SORT_KEY = "ねしくれねしまき"
+
+      # ダイスボットの使い方
+      HELP_MESSAGE = <<~INFO_MESSAGE_TEXT
+        ■ 行為判定
+        nNNx#y: n個のD6を振り、x以上の出目の個数を成功レベルとして判定する
+        n: ダイス数（省略時1）
+        x: 難易度（省略時4）
+        y: 要求成功レベル（省略時1、0は1として扱う）
+
+        ■ 戦闘判定（アタック判定）
+        nNAx#y: n個のD6を振り、x以上を成功とする。y以上の成功は直撃ダメージになる
+        n: ダイス数（省略時1）
+        x: 難易度（省略時4）
+        y: クリティカル値（省略時6、0は1として扱う）
+        通常ダメージ = 成功レベル - 直撃ダメージ
+        直撃ダメージ = 成功した出目のうち y 以上の個数
+        ガッツ減少 = 出目 1 の個数
+
+        ■ ストライクの判定
+        nNS: n個のD6を振り、出目 1 の個数だけガッツ減少を算出する
+        n: ダイス数（省略時1）
+        ガッツ減少が 0 なら成功、1 以上なら失敗
+      INFO_MESSAGE_TEXT
+
+      register_prefix('\d*NN\d*(#\d+)?', '\d*NA\d*(#\d+)?', '\d*NS')
+
+      def eval_game_system_specific_command(command)
+        return eval_action_command(command) || eval_attack_command(command) || eval_guts_command(command)
+      end
+
+      private
+
+      def eval_action_command(command)
+        m = /\A(\d+)?NN(\d+)?(?:#(\d+))?\z/i.match(command)
+        return nil unless m
+
+        dice_count = m[1]&.to_i || 1
+        difficulty = m[2]&.to_i || 4
+        required_level = [m[3]&.to_i || 1, 1].max
+
+        return nil if dice_count.zero?
+
+        command_text = "(#{dice_count}NN#{difficulty}##{required_level})"
+
+        dice_list = @randomizer.roll_barabara(dice_count, 6)
+        success_level = dice_list.count { |value| value >= difficulty }
+        detail_text = "[#{dice_list.join(',')}]"
+
+        return build_result(command_text, detail_text, success_level, required_level)
+      end
+
+      def eval_attack_command(command)
+        m = /\A(\d+)?NA(\d+)?(?:#(\d+))?\z/i.match(command)
+        return nil unless m
+
+        dice_count = m[1]&.to_i || 1
+        difficulty = m[2]&.to_i || 4
+        critical_value = [m[3]&.to_i || 6, 1].max
+
+        return nil if dice_count.zero?
+
+        command_text = "(#{dice_count}NA#{difficulty}##{critical_value})"
+
+        dice_list = @randomizer.roll_barabara(dice_count, 6)
+        success_level = dice_list.count { |value| value >= difficulty }
+        direct_damage = dice_list.count { |value| value >= difficulty && value >= critical_value }
+        guts_loss = dice_list.count(1)
+        detail_text = "[#{dice_list.join(',')}]"
+
+        return build_attack_result(command_text, detail_text, success_level, direct_damage, guts_loss)
+      end
+
+      def eval_guts_command(command)
+        m = /\A(\d+)?NS\z/i.match(command)
+        return nil unless m
+
+        dice_count = m[1]&.to_i || 1
+        return nil if dice_count.zero?
+
+        command_text = "(#{dice_count}NS)"
+        dice_list = @randomizer.roll_barabara(dice_count, 6)
+        guts_loss = dice_list.count(1)
+        detail_text = "[#{dice_list.join(',')}]"
+
+        return build_guts_result(command_text, detail_text, guts_loss)
+      end
+
+      def build_result(command_text, detail_text, success_level, required_level)
+        success = success_level >= required_level
+        judge_text = success ? "成功" : "失敗"
+        text = "#{command_text} ＞ #{detail_text} ＞ 成功レベル#{success_level}/要求#{required_level} ＞ #{judge_text}"
+
+        if success
+          return Result.success(text)
+        end
+
+        return Result.failure(text)
+      end
+
+      def build_attack_result(command_text, detail_text, success_level, direct_damage, guts_loss)
+        normal_damage = [success_level - direct_damage, 0].max
+        success = success_level.positive?
+        damage_text = "通常ダメージ#{normal_damage}/直撃ダメージ#{direct_damage}"
+        damage_text += "/ガッツ減少#{guts_loss}" if guts_loss.positive?
+        text = "#{command_text} ＞ #{detail_text} ＞ 成功レベル#{success_level} ＞ #{damage_text}"
+
+        if success
+          return Result.success(text)
+        end
+
+        return Result.failure(text)
+      end
+
+      def build_guts_result(command_text, detail_text, guts_loss)
+        success = guts_loss.zero?
+        text = "#{command_text} ＞ #{detail_text} ＞ ガッツ減少#{guts_loss}"
+
+        if success
+          return Result.success(text)
+        end
+
+        return Result.failure(text)
+      end
+    end
+  end
+end
diff --git a/test/data/NegikureNegimaki.toml b/test/data/NegikureNegimaki.toml
new file mode 100644
index 000000000..a0753755e
--- /dev/null
+++ b/test/data/NegikureNegimaki.toml
@@ -0,0 +1,254 @@
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "3NN4"
+output = "(3NN4#1) ＞ [6,3,1] ＞ 成功レベル1/要求1 ＞ 成功"
+success = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 3 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "4NN5#3"
+output = "(4NN5#3) ＞ [6,5,2,1] ＞ 成功レベル2/要求3 ＞ 失敗"
+failure = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 2 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "NN4"
+output = "(1NN4#1) ＞ [4] ＞ 成功レベル1/要求1 ＞ 成功"
+success = true
+rands = [
+  { sides = 6, value = 4 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "3NN"
+output = "(3NN4#1) ＞ [3,2,5] ＞ 成功レベル1/要求1 ＞ 成功"
+success = true
+rands = [
+  { sides = 6, value = 3 },
+  { sides = 6, value = 2 },
+  { sides = 6, value = 5 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "NN"
+output = "(1NN4#1) ＞ [2] ＞ 成功レベル0/要求1 ＞ 失敗"
+failure = true
+rands = [
+  { sides = 6, value = 2 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "2NN6"
+output = "(2NN6#1) ＞ [6,1] ＞ 成功レベル1/要求1 ＞ 成功"
+success = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "2NN5#0"
+output = "(2NN5#1) ＞ [4,6] ＞ 成功レベル1/要求1 ＞ 成功"
+success = true
+rands = [
+  { sides = 6, value = 4 },
+  { sides = 6, value = 6 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "2NN1#2"
+output = "(2NN1#2) ＞ [2,2] ＞ 成功レベル2/要求2 ＞ 成功"
+success = true
+rands = [
+  { sides = 6, value = 2 },
+  { sides = 6, value = 2 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "3NN7#1"
+output = "(3NN7#1) ＞ [6,5,1] ＞ 成功レベル0/要求1 ＞ 失敗"
+failure = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "0NN4"
+output = ""
+rands = []
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "2nn4#2"
+output = "(2NN4#2) ＞ [4,4] ＞ 成功レベル2/要求2 ＞ 成功"
+success = true
+rands = [
+  { sides = 6, value = 4 },
+  { sides = 6, value = 4 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "3NA4"
+output = "(3NA4#6) ＞ [6,4,1] ＞ 成功レベル2 ＞ 通常ダメージ1/直撃ダメージ1/ガッツ減少1"
+success = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 4 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "4NA4#5"
+output = "(4NA4#5) ＞ [5,4,3,6] ＞ 成功レベル3 ＞ 通常ダメージ1/直撃ダメージ2"
+success = true
+rands = [
+  { sides = 6, value = 5 },
+  { sides = 6, value = 4 },
+  { sides = 6, value = 3 },
+  { sides = 6, value = 6 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "NA4#6"
+output = "(1NA4#6) ＞ [6] ＞ 成功レベル1 ＞ 通常ダメージ0/直撃ダメージ1"
+success = true
+rands = [
+  { sides = 6, value = 6 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "2NA#5"
+output = "(2NA4#5) ＞ [5,2] ＞ 成功レベル1 ＞ 通常ダメージ0/直撃ダメージ1"
+success = true
+rands = [
+  { sides = 6, value = 5 },
+  { sides = 6, value = 2 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "NA"
+output = "(1NA4#6) ＞ [3] ＞ 成功レベル0 ＞ 通常ダメージ0/直撃ダメージ0"
+failure = true
+rands = [
+  { sides = 6, value = 3 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "2NA4#0"
+output = "(2NA4#1) ＞ [4,1] ＞ 成功レベル1 ＞ 通常ダメージ0/直撃ダメージ1/ガッツ減少1"
+success = true
+rands = [
+  { sides = 6, value = 4 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "2NA1#6"
+output = "(2NA1#6) ＞ [6,1] ＞ 成功レベル2 ＞ 通常ダメージ1/直撃ダメージ1/ガッツ減少1"
+success = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "3NA7#6"
+output = "(3NA7#6) ＞ [6,6,1] ＞ 成功レベル0 ＞ 通常ダメージ0/直撃ダメージ0/ガッツ減少1"
+failure = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 6 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "4NA4#6"
+output = "(4NA4#6) ＞ [1,1,4,6] ＞ 成功レベル2 ＞ 通常ダメージ1/直撃ダメージ1/ガッツ減少2"
+success = true
+rands = [
+  { sides = 6, value = 1 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 4 },
+  { sides = 6, value = 6 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "0NA4"
+output = ""
+rands = []
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "2na4#5"
+output = "(2NA4#5) ＞ [6,4] ＞ 成功レベル2 ＞ 通常ダメージ1/直撃ダメージ1"
+success = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 4 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "3NS"
+output = "(3NS) ＞ [1,4,1] ＞ ガッツ減少2"
+failure = true
+rands = [
+  { sides = 6, value = 1 },
+  { sides = 6, value = 4 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "NS"
+output = "(1NS) ＞ [4] ＞ ガッツ減少0"
+success = true
+rands = [
+  { sides = 6, value = 4 },
+]
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "0NS"
+output = ""
+rands = []
+
+[[ test ]]
+game_system = "NegikureNegimaki"
+input = "2ns"
+output = "(2NS) ＞ [1,6] ＞ ガッツ減少1"
+failure = true
+rands = [
+  { sides = 6, value = 1 },
+  { sides = 6, value = 6 },
+]