Arika's studentship is put in jeopardy when her uniform appears in a store, as she is in need of money to attend. To prove that she did not sell the uniform, Arika places her trust in her new friends to uncover the true culprit, and leads appear to point to Mashiro's cat Mikoto. Unbeknownst to her, a fellow student stole the uniform in order to try to sabotage her. Meanwhile, an unknown individual who knew Arika's mother starts sending her money and letters.