diff --git a/dios/dios.py b/dios/dios.py
index 74ecaf463b8191e8ae502a32e1b3bf327a626ed2..f907d1caa1cfbcc697b261326683e5bd068c11cd 100644
--- a/dios/dios.py
+++ b/dios/dios.py
@@ -243,10 +243,9 @@ class DictOfSeries:
     def _setitem_dios(self, data, value):
         keys = self.columns.intersection(data.columns)
         for k in keys:
-            l = self._data.at[k]
             r = value[k]
-            idx = l.index.intersection(r.index)
-            l[idx] = r[idx]
+            idx = data._data.at[k].index.intersection(r.index)
+            self._data.at[k][idx] = r[idx]
 
     @property
     def loc(self):
diff --git a/dios/locator.py b/dios/locator.py
index 651334b1d63d54de87142f0f4f841b5f93944185..f42d3e15ab04bf0baf960230b6fe0d18bff458ba 100644
--- a/dios/locator.py
+++ b/dios/locator.py
@@ -55,7 +55,8 @@ class _LocIndexer(_Indexer):
 
         data = self._data.loc[colkey].copy()
 
-        # .loc[any, scalar]
+        # .loc[any, scalar] -> (a single) series
+        # .loc[scalar, scalar] -> (a single) value
         if _is_hashable(colkey):
             new = data.loc[rowkey]
 
@@ -63,8 +64,12 @@ class _LocIndexer(_Indexer):
         else:
             for k in data.index:
                 data.at[k] = data.at[k].loc[rowkey]
+
+            # .loc[scalar, non-scalar] -> column-indexed series
             if _is_hashable(rowkey):
                 new = data
+
+            # .loc[non-scalar, non-scalar] -> dios
             else:
                 new = self._dios.copy_empty(columns=False)
                 new._data = data
@@ -106,16 +111,21 @@ class _iLocIndexer(_Indexer):
 
         data = self._data.iloc[colkey].copy()
 
-        # .iloc[any, scalar]
+        # .iloc[any, int] -> single series
+        # .iloc[int, int] -> single value
         if _is_integer(colkey):
             new = data.iloc[rowkey]
 
-        # .iloc[any, non-scalar]
+        # .iloc[any, non-int]
         else:
             for k in data.index:
                 data.at[k] = data.at[k].iloc[rowkey]
+
+            # .iloc[int, non-int] -> column-indexed series
             if _is_integer(rowkey):
                 new = data
+
+            # .iloc[non-int, non-int] -> dios
             else:
                 new = self._dios.copy_empty(columns=False)
                 new._data = data
@@ -127,11 +137,11 @@ class _iLocIndexer(_Indexer):
         if _is_dios_like(rowkey) or _is_dios_like(colkey):
             raise ValueError("Cannot index with multidimensional key")
 
-        # .iloc[any, scalar]
+        # .iloc[any, int]
         if _is_integer(colkey):
             self._data.iat[colkey].iloc[rowkey] = value
 
-        # .iloc[any, non-scalar]
+        # .iloc[any, non-int]
         else:
             for s in self._data.iloc[colkey]:
                 s.iloc[rowkey] = value
@@ -211,7 +221,7 @@ class _aLocIndexer(_Indexer):
             for i, c in enumerate(colkeys):
                 l = self._data.at[c]
                 r = value[c]
-                idx = l.index.intersection(r.index)
+                idx = l.loc[rowkeys[i]].index.intersection(r.index)
                 l[idx] = r[idx]
 
         # row align - align given series to every series in ourself