diff --git a/lib/bcdice/game_system.rb b/lib/bcdice/game_system.rb
index a028fa5ee..5b888d651 100644
--- a/lib/bcdice/game_system.rb
+++ b/lib/bcdice/game_system.rb
@@ -56,6 +56,7 @@
 require "bcdice/game_system/DarkSouls"
 require "bcdice/game_system/DeadlineHeroes"
 require "bcdice/game_system/DemonParasite"
+require "bcdice/game_system/DemonSpike"
 require "bcdice/game_system/DesperateRun"
 require "bcdice/game_system/DetatokoSaga"
 require "bcdice/game_system/DetatokoSaga_Korean"
diff --git a/lib/bcdice/game_system/DemonSpike.rb b/lib/bcdice/game_system/DemonSpike.rb
new file mode 100644
index 000000000..3c4758e1d
--- /dev/null
+++ b/lib/bcdice/game_system/DemonSpike.rb
@@ -0,0 +1,89 @@
+# frozen_string_literal: true
+
+module BCDice
+  module GameSystem
+    class DemonSpike < Base
+      # ゲームシステムの識別子
+      ID = 'DemonSpike'
+
+      # ゲームシステム名
+      NAME = 'デモンスパイク'
+
+      # ゲームシステム名の読みがな
+      SORT_KEY = 'てもんすはいく'
+
+      # ダイスボットの使い方
+      HELP_MESSAGE = <<~INFO_MESSAGE_TEXT
+        ・行為判定 xDS+y
+        　行為判定を行い、達成値、成否、成功度を出力する。
+        　x: ダイス数（省略：2）
+        　y: 能力値やスパイク能力による達成値の修正（省略可）
+      INFO_MESSAGE_TEXT
+
+      register_prefix('\d*DS')
+
+      def eval_game_system_specific_command(command)
+        roll_action(command)
+      end
+
+      private
+
+      def roll_action(command)
+        parser = Command::Parser.new("DS", round_type: @round_type)
+                                .enable_prefix_number
+                                .restrict_cmp_op_to(nil)
+        parsed = parser.parse(command)
+        unless parsed
+          return nil
+        end
+
+        parsed.prefix_number ||= 2
+        if parsed.prefix_number < 2
+          return nil
+        end
+
+        step = roll_step(parsed.prefix_number)
+        step_list = [step]
+        while step[:dice_sum] == 10
+          step = roll_step(parsed.prefix_number)
+          step_list.push(step)
+        end
+
+        is_fumble = step_list[0][:dice_sum] == 2
+        total = is_fumble ? 0 : step_list.sum { |s| s[:dice_sum] } + parsed.modify_number
+        success_level = total / 10
+        is_success = total >= 10
+
+        res =
+          if is_success
+            "成功, 成功度#{success_level}"
+          elsif is_fumble
+            "自動的失敗"
+          else
+            "失敗"
+          end
+
+        sequence = [
+          "(#{parsed})",
+          step_list.map { |s| "#{s[:dice_sum]}[#{s[:dice_list].join(',')}]" },
+          total,
+          res,
+        ].flatten
+
+        return Result.new.tap do |r|
+          r.condition = is_success
+          r.critical = step_list.length > 1
+          r.fumble = is_fumble
+          r.text = sequence.join(" ＞ ")
+        end
+      end
+
+      def roll_step(times)
+        dice_list = @randomizer.roll_barabara(times, 6).sort.reverse
+        dice_sum = (dice_list[0] + dice_list[1]).clamp(2, 10)
+
+        return {dice_list: dice_list, dice_sum: dice_sum}
+      end
+    end
+  end
+end
diff --git a/test/data/DemonSpike.toml b/test/data/DemonSpike.toml
new file mode 100644
index 000000000..31b25c8cf
--- /dev/null
+++ b/test/data/DemonSpike.toml
@@ -0,0 +1,141 @@
+[[ test ]]
+game_system = "DemonSpike"
+input = "DS+7"
+output = "(2DS+7) ＞ 9[5,4] ＞ 16 ＞ 成功, 成功度1"
+success = true
+rands = [
+  { sides = 6, value = 4 },
+  { sides = 6, value = 5 },
+]
+
+[[ test ]]
+game_system = "DemonSpike"
+input = "DS+7"
+output = "(2DS+7) ＞ 10[6,5] ＞ 10[6,6] ＞ 2[1,1] ＞ 29 ＞ 成功, 成功度2"
+success = true
+critical = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 6 },
+  { sides = 6, value = 6 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "DemonSpike"
+input = "DS+8"
+output = "(2DS+8) ＞ 10[6,5] ＞ 10[6,6] ＞ 2[1,1] ＞ 30 ＞ 成功, 成功度3"
+success = true
+critical = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 6 },
+  { sides = 6, value = 6 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "DemonSpike"
+input = "DS+6"
+output = "(2DS+6) ＞ 3[2,1] ＞ 9 ＞ 失敗"
+failure = true
+rands = [
+  { sides = 6, value = 2 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "DemonSpike"
+input = "DS+7"
+output = "(2DS+7) ＞ 2[1,1] ＞ 0 ＞ 自動的失敗"
+failure = true
+fumble = true
+rands = [
+  { sides = 6, value = 1 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "DemonSpike"
+input = "DS"
+output = "(2DS) ＞ 10[5,5] ＞ 7[5,2] ＞ 17 ＞ 成功, 成功度1"
+success = true
+critical = true
+rands = [
+  { sides = 6, value = 5 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 2 },
+]
+
+[[ test ]]
+game_system = "DemonSpike"
+input = "DS"
+output = "(2DS) ＞ 9[5,4] ＞ 9 ＞ 失敗"
+failure = true
+rands = [
+  { sides = 6, value = 4 },
+  { sides = 6, value = 5 },
+]
+
+[[ test ]]
+game_system = "DemonSpike"
+input = "3DS+7"
+output = "(3DS+7) ＞ 9[5,4,3] ＞ 16 ＞ 成功, 成功度1"
+success = true
+rands = [
+  { sides = 6, value = 4 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 3 },
+]
+
+[[ test ]]
+game_system = "DemonSpike"
+input = "3DS+7"
+output = "(3DS+7) ＞ 3[2,1,1] ＞ 10 ＞ 成功, 成功度1"
+success = true
+rands = [
+  { sides = 6, value = 1 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 2 },
+]
+
+[[ test ]]
+game_system = "DemonSpike"
+input = "3DS+7"
+output = "(3DS+7) ＞ 2[1,1,1] ＞ 0 ＞ 自動的失敗"
+failure = true
+fumble = true
+rands = [
+  { sides = 6, value = 1 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "DemonSpike"
+input = "3DS+7"
+output = "(3DS+7) ＞ 10[6,5,1] ＞ 10[6,6,1] ＞ 2[1,1,1] ＞ 29 ＞ 成功, 成功度2"
+success = true
+critical = true
+rands = [
+  { sides = 6, value = 6 },
+  { sides = 6, value = 5 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 6 },
+  { sides = 6, value = 6 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 1 },
+  { sides = 6, value = 1 },
+]
+
+[[ test ]]
+game_system = "DemonSpike"
+input = "1DS"
+output = ""
+rands = []