diff --git a/src/diceBot/Fiasco.rb b/src/diceBot/Fiasco.rb
new file mode 100644
index 000000000..34bee85de
--- /dev/null
+++ b/src/diceBot/Fiasco.rb
@@ -0,0 +1,113 @@
+# -*- coding: utf-8 -*-
+# frozen_string_literal: true
+
+class Fiasco < DiceBot
+  # ゲームシステムの識別子
+  ID = 'Fiasco'
+
+  # ゲームシステム名
+  NAME = 'フィアスコ'
+
+  # ゲームシステム名の読みがな
+  SORT_KEY = 'ふいあすこ'
+
+  # ダイスボットの使い方
+  HELP_MESSAGE = <<INFO_MESSAGE_TEXT
+  ・判定コマンド(FSx, WxBx)
+    相関図・転落要素用(FSx)：相関図や転落要素のためにx個ダイスを振り、出目ごとに分類する
+    黒白差分判定用(WxBx)  ：転落、残響のために白ダイス(W指定)と黒ダイス(B指定)で差分を求める
+      ※ WとBは片方指定(Bx, Wx)、入替指定(WxBx,BxWx)可能
+
+INFO_MESSAGE_TEXT
+
+  COMMAND_TYPE_INDEX = 1
+
+  START_DICE_INDEX = 2
+
+  BW_FIRST_DICE_INDEX = 2
+  BW_SECOND_DICE_INDEX = 5
+  BW_SECOND_DICE_TAG_INDEX = 4
+
+  START_COMMAND_TAG = "FS"
+  W_DICEROLL_COMMAND_TAG = "W"
+  B_DICEROLL_COMMAND_TAG = "B"
+
+  setPrefixes(['(FS|[WB])(\d+).*'])
+
+  def rollDiceCommand(command)
+    m = /\A(FS|[WB])(\d+)(([WB])(\d+))?/.match(command)
+    unless m
+      return ''
+    end
+
+    type = m[COMMAND_TYPE_INDEX]
+    if type == START_COMMAND_TAG
+      return makeStartDiceRoll(m)
+    else
+      return makeWhiteBlackDiceRoll(type, m)
+    end
+  end
+
+  def makeStartDiceRoll(m)
+    dice = m[START_DICE_INDEX]
+    _, diceText, = roll(dice, 6)
+
+    diceList = [0, 0, 0, 0, 0, 0]
+
+    diceText.split(',').each do |takeDice|
+      diceList[takeDice.to_i - 1] += 1
+    end
+
+    return "１ => #{diceList[0]}個 ２ => #{diceList[1]}個 ３ => #{diceList[2]}個 ４ => #{diceList[3]}個 ５ => #{diceList[4]}個 ６ => #{diceList[5]}個"
+  end
+
+  def makeWhiteBlackDiceRoll(type, m)
+    if type == W_DICEROLL_COMMAND_TAG
+      whiteTotal, whiteDiceText, blackTotal, blackDiceText = makeArgsDiceRoll(m[BW_FIRST_DICE_INDEX], m[BW_SECOND_DICE_INDEX])
+      result = "白#{whiteTotal}[#{whiteDiceText}]"
+      if blackDiceText
+        if m[BW_SECOND_DICE_TAG_INDEX] == W_DICEROLL_COMMAND_TAG
+          return "#{m}：白指定(#{W_DICEROLL_COMMAND_TAG})は重複できません。"
+        end
+
+        result += " 黒#{blackTotal}[#{blackDiceText}]"
+      end
+    elsif type == B_DICEROLL_COMMAND_TAG
+      blackTotal, blackDiceText, whiteTotal, whiteDiceText = makeArgsDiceRoll(m[BW_FIRST_DICE_INDEX], m[BW_SECOND_DICE_INDEX])
+      result = "黒#{blackTotal}[#{blackDiceText}]"
+      if whiteDiceText
+        if m[BW_SECOND_DICE_TAG_INDEX] == B_DICEROLL_COMMAND_TAG
+          return "#{m}：黒指定(#{B_DICEROLL_COMMAND_TAG})は重複できません。"
+        end
+
+        result += " 白#{whiteTotal}[#{whiteDiceText}]"
+      end
+    else
+      return ''
+    end
+
+    if blackTotal > whiteTotal
+      return "#{result} ＞ 黒#{blackTotal - whiteTotal}"
+    elsif blackTotal < whiteTotal
+      return "#{result} ＞ 白#{whiteTotal - blackTotal}"
+    end
+
+    return "#{result} ＞ 0"
+  end
+
+  def makeArgsDiceRoll(firstDice, secondDice)
+    secondTotal = 0
+
+    firstTotal, firstDiceText, = roll(firstDice, 6)
+
+    if secondDice
+      if secondDice.to_i > 0
+        secondTotal, secondDiceText, = roll(secondDice, 6)
+      else
+        secondDiceText = "0"
+      end
+    end
+
+    return firstTotal, firstDiceText, secondTotal, secondDiceText
+  end
+end
diff --git a/src/test/data/Fiasco.txt b/src/test/data/Fiasco.txt
new file mode 100644
index 000000000..67599f2a7
--- /dev/null
+++ b/src/test/data/Fiasco.txt
@@ -0,0 +1,119 @@
+input:
+FS12
+output:
+Fiasco : １ => 3個 ２ => 2個 ３ => 1個 ４ => 3個 ５ => 1個 ６ => 2個
+rand:1/6,2/6,1/6,3/6,4/6,6/6,4/6,5/6,6/6,4/6,2/6,1/6
+============================
+input:
+W3B3
+output:
+Fiasco : 白6[1,2,3] 黒15[4,5,6] ＞ 黒9
+rand:1/6,2/6,3/6,4/6,5/6,6/6
+============================
+input:
+W3B3
+output:
+Fiasco : 白12[4,5,3] 黒8[1,5,2] ＞ 白4
+rand:4/6,5/6,3/6,1/6,5/6,2/6
+============================
+input:
+W6
+output:
+Fiasco : 白20[4,5,3,1,5,2] ＞ 白20
+rand:4/6,5/6,3/6,1/6,5/6,2/6
+============================
+input:
+B6
+output:
+Fiasco : 黒20[4,5,3,1,5,2] ＞ 黒20
+rand:4/6,5/6,3/6,1/6,5/6,2/6
+============================
+input:
+W6B0
+output:
+Fiasco : 白20[4,5,3,1,5,2] 黒0[0] ＞ 白20
+rand:4/6,5/6,3/6,1/6,5/6,2/6
+============================
+input:
+B6W0
+output:
+Fiasco : 黒20[4,5,3,1,5,2] 白0[0] ＞ 黒20
+rand:4/6,5/6,3/6,1/6,5/6,2/6
+============================
+input:
+B3W3
+output:
+Fiasco : 黒8[1,5,2] 白8[1,5,2] ＞ 0
+rand:1/6,5/6,2/6,1/6,5/6,2/6
+============================
+input:
+W3W3
+output:
+Fiasco : W3W3：白指定(W)は重複できません。
+rand:1/6,2/6,3/6,4/6,5/6,6/6
+============================
+input:
+B3B3
+output:
+Fiasco : B3B3：黒指定(B)は重複できません。
+rand:4/6,5/6,3/6,1/6,5/6,2/6
+============================
+input:
+SFS12
+output:
+Fiasco : １ => 3個 ２ => 2個 ３ => 1個 ４ => 3個 ５ => 1個 ６ => 2個###secret dice###
+rand:1/6,2/6,1/6,3/6,4/6,6/6,4/6,5/6,6/6,4/6,2/6,1/6
+============================
+input:
+SW3B3
+output:
+Fiasco : 白6[1,2,3] 黒15[4,5,6] ＞ 黒9###secret dice###
+rand:1/6,2/6,3/6,4/6,5/6,6/6
+============================
+input:
+SW3B3
+output:
+Fiasco : 白12[4,5,3] 黒8[1,5,2] ＞ 白4###secret dice###
+rand:4/6,5/6,3/6,1/6,5/6,2/6
+============================
+input:
+SW6
+output:
+Fiasco : 白20[4,5,3,1,5,2] ＞ 白20###secret dice###
+rand:4/6,5/6,3/6,1/6,5/6,2/6
+============================
+input:
+SB6
+output:
+Fiasco : 黒20[4,5,3,1,5,2] ＞ 黒20###secret dice###
+rand:4/6,5/6,3/6,1/6,5/6,2/6
+============================
+input:
+SW6B0
+output:
+Fiasco : 白20[4,5,3,1,5,2] 黒0[0] ＞ 白20###secret dice###
+rand:4/6,5/6,3/6,1/6,5/6,2/6
+============================
+input:
+SB6W0
+output:
+Fiasco : 黒20[4,5,3,1,5,2] 白0[0] ＞ 黒20###secret dice###
+rand:4/6,5/6,3/6,1/6,5/6,2/6
+============================
+input:
+SB3W3
+output:
+Fiasco : 黒8[1,5,2] 白8[1,5,2] ＞ 0###secret dice###
+rand:1/6,5/6,2/6,1/6,5/6,2/6
+============================
+input:
+SW3W3
+output:
+Fiasco : W3W3：白指定(W)は重複できません。###secret dice###
+rand:1/6,2/6,3/6,4/6,5/6,6/6
+============================
+input:
+SB3B3
+output:
+Fiasco : B3B3：黒指定(B)は重複できません。###secret dice###
+rand:4/6,5/6,3/6,1/6,5/6,2/6