So Cute It Hurts!! Vol. 3 (manga)

Megumu is almost done taking Mitsuru’s make-up classes for him, and it’s nearly time for the twins to go back to their own lives. But then catastrophe hits! Megumu’s true love, Aoi, discovers she’s really a girl and goes into an allergic fit. How will she ever face him again? And even worse, Mitsuru’s sworn enemy, Azusa, finds out he’s really a dude. What will happen when she spills the secret to his sweetheart, Shino?!