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...

Sumire, a 26-year-old pattern maker who has been heartbroken because of her tendency to overdo it. She tries her best to support his colleague's designer boyfriend, but he is coldly thrown out and loses love...

Brother and sister born between humans and youkai, are caught up in the war between human and monsters...