CCG Writes – “9-nine-:Episode 2 takes place in a parallel universe with a different chain of events due to the main character, Kakeru, letting his pushy sister, Sora, sleep over at his place. That one decision leads to less murders taking place in the small town of Shiromitsugawa. A different romance is possible for Kakeru and new bonds are formed in this episode as well.”
source: gamezpot.com