One day, Shiori Maezawa, an ordinary high school girl, cracked her smartphone while falling down a staircase. As she wakes up, she finds herself in a deserted, parallel world that looks like Yokohama.
 
When she looks at her smartphone, she finds a photo of herself that she doesn't remember posting on social media. What’s the source of this mysterious post?
 
Will she be able to escape from this strange smartphone labyrinth?
 
(Source: Official Site, translated)

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