At his aunt's home, high school student Niwa Makoto encounters his enigmatic cousin, Touwa Erio, who bizarrely drapes a futon around herself and believes she's an alien. Sustaining on pizza, Erio resurfaces after a mysterious six-month disappearance, devoid of memories from that time and convinced of extraterrestrial involvement, leading her to roam the streets cloaked in her futon.
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