Big in Japan April 4-10: Earth Defense Force 2 PSP - GameSpot

D3Publisher's portable port of PS2 giant insect shooter knocks latest Dragon Quest Monsters from top spot after a single week in stores, PSP retains lead on 3DS sales.
Check out new tales of these new warriors and an enhanced battle system.

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Earth Defense Force 2: Invaders From Planet Space - FAQ - PlayStation Vita - By eastx - GameFAQs

A Swarm Of Earth Defense Portable 2 Screens - Siliconera

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Earth Defense Force 2 Portable [Japan Import] : Video Games

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Earth Defense Force 2 Portable [Japan Import] : Video Games

Earth Defense Force 2: Invaders From Planet Space - FAQ - PlayStation Vita - By eastx - GameFAQs

Earth Defense Force 2: Invaders From Planet Space - FAQ - PlayStation Vita - By eastx - GameFAQs

Earth Defense Force 2 Portable English/Spanish UI + PS2 Textures/AI Upscale

PSP Tops Both Charts in Japan (Again), Saved by Earth Defense Forces 2

GamerGuy's Reviews: It Came From Japan: The Earth Defense Force & Earth Defense Force 2 (PS2)