diff --git a/ojosama_test.go b/ojosama_test.go
index e26b5a8..f7b5af2 100644
--- a/ojosama_test.go
+++ b/ojosama_test.go
@@ -17,7 +17,7 @@ func TestConvert(t *testing.T) {
 		{
 			desc:    "正常系: 名詞の手前には「お」をお付けいたしますわ",
 			src:     "これはハーブです",
-			want:    "これはおハーブですわ",
+			want:    "こちらはおハーブですわ",
 			opt:     nil,
 			wantErr: false,
 		},
@@ -101,7 +101,7 @@ func TestConvert(t *testing.T) {
 		{
 			desc:    "正常系: アルファベット単語の場合は「お」をつけませんの",
 			src:     "これはgrassです。あれはabcdefg12345です",
-			want:    "これはgrassですわ。あれはabcdefg12345ですわ",
+			want:    "こちらはgrassですわ。あちらはabcdefg12345ですわ",
 			opt:     nil,
 			wantErr: false,
 		},
@@ -171,7 +171,7 @@ func TestConvert(t *testing.T) {
 		{
 			desc: "正常系: 波線のばしを付与する場合がありますわ",
 			src:  "これはハーブです！",
-			want: "これはおハーブですわ～～！！！",
+			want: "こちらはおハーブですわ～～！！！",
 			opt: &ConvertOption{
 				forceAppendLongNote: forceAppendLongNote{
 					enable:               true,
@@ -348,6 +348,34 @@ func TestConvert(t *testing.T) {
 			opt:     nil,
 			wantErr: false,
 		},
+		{
+			desc:    "正常系: こそあど言葉（こ）にも対応しておりましてよ",
+			src:     "これ、この、ここ、こちら、こう、こんな。",
+			want:    "こちら、こちらの、こちら、こちら、こう、このような。",
+			opt:     nil,
+			wantErr: false,
+		},
+		{
+			desc:    "正常系: こそあど言葉（そ）にも対応しておりましてよ",
+			src:     "それ、その、そこ、そちら、そう、そんな。",
+			want:    "そちら、そちらの、そちら、そちら、そう、そのような。",
+			opt:     nil,
+			wantErr: false,
+		},
+		{
+			desc:    "正常系: こそあど言葉（あ）にも対応しておりましてよ",
+			src:     "あれは、あの、あそこ、あちら、ああ、あんな。",
+			want:    "あちらは、あちらの、あちら、あちら、ああ、あのような。",
+			opt:     nil,
+			wantErr: false,
+		},
+		{
+			desc:    "正常系: こそあど言葉（ど）にも対応しておりましてよ",
+			src:     "どれ、どの、どこ、どちら、どう、どんな。",
+			want:    "どちら、どちらの、どちら、どちら、どう、どのような。",
+			opt:     nil,
+			wantErr: false,
+		},
 	}
 
 	for _, tt := range tests {
diff --git a/rule.go b/rule.go
index 8c8c251..230be1f 100644
--- a/rule.go
+++ b/rule.go
@@ -272,6 +272,8 @@ var (
 	}
 
 	convertRules = []convertRule{
+		// 名詞、代名詞、一般
+		// 三人称
 		{
 			Conditions: []convertCondition{
 				{
@@ -285,6 +287,7 @@ var (
 			},
 			Value: "貴方",
 		},
+		// 一人称
 		{
 			Conditions: []convertCondition{
 				{
@@ -427,6 +430,193 @@ var (
 			},
 			Value: "ママ上",
 		},
+
+		// こそあど言葉
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"名詞", "代名詞", "一般"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"これ"},
+				},
+			},
+			Value: "こちら",
+		},
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"連体詞"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"この"},
+				},
+			},
+			Value: "こちらの",
+		},
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"名詞", "代名詞", "一般"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"ここ"},
+				},
+			},
+			Value: "こちら",
+		},
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"連体詞"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"こんな"},
+				},
+			},
+			Value: "このような",
+		},
+
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"名詞", "代名詞", "一般"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"それ"},
+				},
+			},
+			Value: "そちら",
+		},
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"連体詞"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"その"},
+				},
+			},
+			Value: "そちらの",
+		},
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"名詞", "代名詞", "一般"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"そこ"},
+				},
+			},
+			Value: "そちら",
+		},
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"連体詞"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"そんな"},
+				},
+			},
+			Value: "そのような",
+		},
+
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"名詞", "代名詞", "一般"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"あれ"},
+				},
+			},
+			Value: "あちら",
+		},
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"連体詞"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"あの"},
+				},
+			},
+			Value: "あちらの",
+		},
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"名詞", "代名詞", "一般"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"あそこ"},
+				},
+			},
+			Value: "あちら",
+		},
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"連体詞"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"あんな"},
+				},
+			},
+			Value: "あのような",
+		},
+
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"名詞", "代名詞", "一般"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"どれ"},
+				},
+			},
+			Value: "どちら",
+		},
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"連体詞"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"どの"},
+				},
+			},
+			Value: "どちらの",
+		},
 		{
 			Conditions: []convertCondition{
 				{
@@ -440,6 +630,20 @@ var (
 			},
 			Value: "どちら",
 		},
+		{
+			Conditions: []convertCondition{
+				{
+					Type:  convertTypeFeatures,
+					Value: []string{"連体詞"},
+				},
+				{
+					Type:  convertTypeSurface,
+					Value: []string{"どんな"},
+				},
+			},
+			Value: "どのような",
+		},
+
 		{
 			Conditions: []convertCondition{
 				{