Masako Shimomura, who is the chairman of the discipline and is called a serious girl, had a secret that she loved anime and made her own cosplay costume. Masako who brought a cosplay item to school drops it. It was Harumo who witnessed it. Masako, who originally misunderstood the witch clothes as cosplay and had a sense of intimacy, was impressed by Rurumo who did not make a fool of her hobby, and invited Rurumo to a cosplay event. Rurumo will watch her recommended anime and make cosplay costumes together. Then, Rurumo tells Kota that the other party is Masako. Without knowing that Masako…