Intercept the Airspace Invaders is the fourth stage from M.U.S.H.A..
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The enemies launch an attack on mainland Japan, so the M.U.S.H.A. team is sent to intercept their forces on the sky while the army fights the enemies on the ground.
Though this stage is simpler than the previous ones much tougher enemies will appear, many of which coming from below the clouds in the background, though their silhouette can be seen through the clouds.