Monsters - the Twisted, that spawned in the far future devoured all the humans, and when they destroyed the whole earth, they spiral time backwards to the past to repeat the carnage. In 2012, the authorities created the Over Dive system, a weapon that could perhaps save the future and the past. However, there is only one person who's compatible with this technology - Aya Brea, the girl without a past.

Travel through time and eliminate the horde of Twisted. Take over the bodies of the people who inhabits the time frame to battle. The Over Dive system offers you one chance to turn the situation around when it reaches the full gauge, your attack power rises several times fold. But one mistake, you'll be gone, and the world will go with you.
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