Labyrinth.

Shiori is a typical high school student who dreams of online stardom, but struggles to capture attention. After an embarrassing video of her goes viral, she gets trapped in her smartphone and replaced by a charismatic alter ego. As the doppelganger charms the internet and devises a nefarious plot to replace mankind with brainrot, Shiori must partner with other online outcasts to stop her digital counterpart and reclaim her life in the real world.