9-nine-: Episode 2

The many-worlds interpretation posits that every random motion produces a novel branching universe. A butterfly flapping its wings rarely means a hurricane across the world, and human choices are no exception—our little everyday choices rarely bring about earth-shattering changes. But for Kakeru Niimi, one of those little decisions is about to make a big difference.

One night, Kakeru's cheeky little sister Sora asks him to let her stay the night. And from the seemingly inconsequential moment wh...