diff --git a/main.hsp b/main.hsp
index c66a9b3..ce8c725 100644
--- a/main.hsp
+++ b/main.hsp
@@ -7,8 +7,8 @@
 
 #const NIZIKA_WIDTH	300
 #const NIZIKA_HEIGHT	300
-#const NIZIKA_BASE	240
-#const NIZIKA_LEFT	 60
+#const NIZIKA_BASE	236
+#const NIZIKA_LEFT	100
 #const NIZIKA_RIGHT	250
 
 
@@ -17,6 +17,8 @@
 	SetWindowLong hWnd, GWL_EXSTYLE, GetWindowLong (hWnd, GWL_EXSTYLE) Or WS_EX_LAYERED
 	SetLayeredWindowAttributes hWnd, RGBCOLOUR_LIME, False, True
 
+	HWND_DESKTOP = GetDesktopWindow ()	; デスクトップ取得
+
 	Color COLOUR_LIME
 	BoxF
 
@@ -34,8 +36,38 @@
 
 	moving = False
 	falling = True
+	base = gInfo_dispY
 
 	Repeat
+		Dim hWindows, 1
+		Dim windowRects, 4, 1
+
+		hWindows.0 = GetTopWindow (HWND_DESKTOP)
+		hWindowBefore = hWindows.0
+		GetWindowRect hWindows.0, VarPtr (windowRects.0.0)
+
+		windowCnt = 1
+
+		Repeat
+			hWindow = GetWindow (hWindowBefore, GW_HWNDNEXT)
+
+			If hWindow = 0 {
+				Break
+			}
+
+			buf = ""
+			GetWindowText hWindow, VarPtr (buf), 256
+
+			If (IsWindowVisible (hWindow) != False) And (StrLen (buf) != 0) {
+				hWindows.windowCnt = hWindow
+				GetWindowRect hWindow, VarPtr (windowRects.0.windowCnt)
+
+				windowCnt++
+			}
+
+			hWindowBefore = hWindow
+		Loop
+
 		If GetKey2 (KEY_MOUSE_L) {
 			If moving {
 				nizikaX = LimitF (mouseX - offsetX, -NIZIKA_LEFT, gInfo_dispX - NIZIKA_RIGHT)
@@ -55,12 +87,22 @@
 			fallVel = 0.
 		}
 		Else: If falling {
-			nizikaY = LimitF (nizikaY + fallVel, Null, gInfo_dispY - NIZIKA_BASE)
+			nizikaY = LimitF (nizikaY + fallVel, Null, base - NIZIKA_BASE)
 			fallVel += 9.8
 
-			If nizikaY >= gInfo_dispY - NIZIKA_BASE {
-				falling = False
+			If nizikaY >= base - NIZIKA_BASE {
+				fallVel = 0.
 			}
+
+			base = gInfo_dispY
+
+			Repeat windowCnt
+				If (windowRects.0.cnt <= nizikaX + (NIZIKA_WIDTH - NIZIKA_LEFT)) And (nizikaX + NIZIKA_LEFT < windowRects.2.cnt) {
+					If (nizikaY + NIZIKA_BASE <= windowRects.1.cnt) And (windowRects.1.cnt < base) {
+						base = windowRects.1.cnt
+					}
+				}
+			Loop
 		}
 
 		ReDraw False