NISA have announced they are bringing the PSP game by IMAGEEPOCH INC Black Rock Shooter The Game to the West. the game will come out on the PSN next Tuesday, 23rd April, across the USA and the next day across the EU and it should work fine on the PS Vita.
Black Rock Shooter The Game takes place in 2032 on earth. aliens have been attacking the earth for 19 years and now humanity is on the brink. Black Rock Shooter has been created to defeat them once and for all, but by the time she is awakened there are only 12 humans left. as well as a main story there are side quests and mini games.
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Source: USA PlayStation Blog