A prequel to 'Multiple Personality Girl' tells the story of Momoka Nishizawa just before she enters the world of Fuyuki and Keroro. 'Dark Momoka' makes her first appearance when she sees Tamama being beaten up by an alien dog! Grrr...! Also in this volume, Sgt. Frog comes up with yet another wacky plan to get back at Natsumi. His bright idea? Turn himself into a mosquito and suck her blood!