Meikyuu no Shiori

A high school girl named Shiori Maezawa drops her smartphone down a staircase, causing it to crack. After waking up, she discovers she is in an unfamiliar version of Yokohama that appears to be a separate world. Checking her phone, she finds a photo of herself that she has no memory of sharing online. The origin of the image remains unclear. She must navigate this strange environment, which seems connected to her smartphone, in search of a way to return to her original world.