diff --git a/blind75/binary/sum-of-two-integers/answer.md b/blind75/binary/sum-of-two-integers/answer.md
new file mode 100644
index 0000000..e2b2d81
--- /dev/null
+++ b/blind75/binary/sum-of-two-integers/answer.md
@@ -0,0 +1,58 @@
+# Title
+
+## STEP1
+
+### 発想
+
+### 想定されるユースケース
+
+### 何が分からなかったか?
+
+```javascript
+const getSum = function(a, b) {
+    const except_carry = a ^ b
+    const carry = (a & b) << 1
+    return except_carry + carry
+};
+```
+
+```javascript
+// a is positive
+// b is positiveの時
+const getSum = function(a, b) {
+    while (b !== 0) {
+        const sum_without_carry = a ^ b
+        const carry = (a & b) << 1
+        a = sum_without_carry
+        b = carry
+    }
+    return a
+};
+```
+
+## STEP2
+
+```javascript
+```
+
+## STEP3
+
+```javascript
+```
+
+## 感想
+
+### コメント集を読んで
+
+## 他の人のPRを読んで
+
+## その他の方法
+
+### コードの良し悪し
+
+* `*0`
+
+* `*1`
+
+## 調べたこと
+