Can you write a story idea using looping time travel for me? Make it anime style.
Jun is an analytical man of few words. He doesn't often speak, but when he does, people listen. He only has a few friends, but they are closer than anyone else. One day, Jun is going to see his grandmother with his friends, Hisako and Miko. When they arrive, though, his grandmother is dead, another copy of her standing over her body. That copy rushes them with inhuman speed, vaulting over the couch to reach Jun and his friends before they can escape. One quick slash from a knife is all it took to kill the three of them.

As Jun lay on the ground bleeding out, he held his friends' hands. Something deep stirred within him as he pleaded for them to survive this ordeal somehow. He takes a final, shallow breath before snapping awake three days earlier. He's alive and breathing. He calls his friends, who are both surprised to hear from him so early. On this second loop, he quickly realizes that it wasn't a dream and that if things continued down the same path, they'd die once again. 

He tells his friends, afraid that they won't believe him. However, what he speaks is always the truth. They have no reason to doubt his words. Together they try to stop his grandmother's death. In the process, they uncover a much deeper, much darker secret. They fail the second time. However, Jun now understands that what he is dealing with goes far beyond just himself. 

Recruiting his friends once again, they set out on a journey to prevent the collapse of the human race itself. They stand in defiance of a god. 