Utano Hiro was living a normal life as a researcher until a strange event changed everything. When he wakes up, he finds himself trapped in a ruined world filled with terrifying monsters known as aberrant beings.
His only hope is a mysterious gun called ES707, a weapon with the power to rewind time. Determined to reunite with his beloved Emma, Hiro begins a dangerous journey through the apocalypse, using the gun to travel back through time.
As he meets survivors, fights deadly enemies, and repeatedly changes the past, Hiro slowly uncovers the truth behind the world's destruction. What happened on Day 0, the day everything began? And can he reach it before it's too late?
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