diff --git a/lib/ika3/weapons.rb b/lib/ika3/weapons.rb
index 5959c0e..1d7830a 100644
--- a/lib/ika3/weapons.rb
+++ b/lib/ika3/weapons.rb
@@ -41,12 +41,20 @@ def filter_by_sub(sub_name)
         weapons.map { |weapon| W.new(weapon) }
       end
 
+      def filter_by_special(special_name)
+        raise "unknown special weapon: #{special_name}" unless special_weapons.values.include?(special_name)
+
+        weapons = config.values.filter { |weapon| weapon[:special] == special_name }
+        weapons.map { |weapon| W.new(weapon) }
+      end
+
       def reload_config!
         @cache = {}
         @config = nil
         @sub_weapons = nil
         config
         config_sub_weapons
+        config_special_weapons
       end
 
       private
@@ -75,6 +83,16 @@ def sub_weapons
         @sub_weapon_hash
       end
 
+      def special_weapons
+        @special_weapon_hash ||= {}
+        if @special_weapon_hash.empty?
+          config_special_weapons.each do |key, value|
+            @special_weapon_hash[key] = value[:name]
+          end
+        end
+        @special_weapon_hash
+      end
+
       def config
         @config ||= load_yaml_file("#{File.dirname(__FILE__)}/../../config/weapons.yml").deep_symbolize_keys
         @config
@@ -85,6 +103,11 @@ def config_sub_weapons
         @sub_weapons
       end
 
+      def config_special_weapons
+        @special_weapons ||= load_yaml_file("#{File.dirname(__FILE__)}/../../config/special_weapons.yml").deep_symbolize_keys
+        @special_weapons
+      end
+
       def valid?(weapon_key)
         names.include?(weapon_key)
       end
diff --git a/sig/ika3/weapon.rbs b/sig/ika3/weapon.rbs
index 5d7ac03..6936858 100644
--- a/sig/ika3/weapon.rbs
+++ b/sig/ika3/weapon.rbs
@@ -5,16 +5,21 @@ module Ika3
     self.@weapon_hash: Hash[untyped, untyped]
     self.@sub_weapon_hash: Hash[untyped, untyped]
     self.@sub_weapons: untyped
+    self.@special_weapon_hash: Hash[untyped, untyped]
+    self.@special_weapons: untyped
 
     def self.find: (Symbol weapon_key) -> W
     def self.find_by_name: (String weapon_name) -> W
     def self.filter_by_sub: (String sub_name) -> Array[W]
+    def self.filter_by_special: (String special_name) -> Array[W]
     def self.reload_config!: -> nil
     def self.names: -> Array[Symbol]
     def self.weapons: -> Hash[untyped, untyped]
     def self.sub_weapons: -> Hash[untyped, untyped]
+    def self.special_weapons: -> Hash[untyped, untyped]
     def self.config: -> untyped
     def self.config_sub_weapons: -> untyped
+    def self.config_special_weapons: -> untyped
     def self.valid?: (Symbol weapon_key) -> bool
     def self.load_yaml_file: (String file) -> untyped
 
diff --git a/spec/ika3/weapons_spec.rb b/spec/ika3/weapons_spec.rb
index a1c6409..129f47d 100644
--- a/spec/ika3/weapons_spec.rb
+++ b/spec/ika3/weapons_spec.rb
@@ -19,6 +19,12 @@
     end
   end
 
+  describe '#filter_by_special' do
+    it 'get weapon info list from special weapon' do
+      expect(described_class.filter_by_special(special_name).map(&:name)).to include weapon_name
+    end
+  end
+
   describe '#name' do
     it 'get weapon name' do
       expect(described_class.find(key_name).name).to eq weapon_name