Sayuki, a college student who is killing her true self so as not to be disliked by her friends. She accidentally picks up a notebook dropped by a traffic accident victim and finds that a business card is sandwiched between them. The sentence written on the business card was "Erase your unnecessary emotions." When Sayuki visited the address written on the business card to find the owner of the notebook that she had brought, it was a normal coffee shop. She steps into the store, but the place guided by the master is in the basement of the store. What appeared before Sayuki was confused ...?