An unidentified monster "Wasuremono" that only humans who solve a mystery can meet. The being eats the memories that humans want to erase. One day Yayoi, a high school girl who suffers from the tragic memories of her older brother, visits him. While being swayed by the free-spirited wasuremono, what is the truth she finally arrived at?! ? Is the happiness behind the memory erased? Or... The long-awaited serialization of Mysterious Fantasy!