Oniisama e Episode 4 English Subbed Episode Title:The Music Box.Episode Description:Despite missing the selection party, Nanako has her interview, and humiliates herself. Mariko and Nanako realize that anyone could have left the message for Nanako, but Mariko correctly suspects Aya. Nanako and Mariko are notified of their selection to be in the Sorority, and Aya steps up her campaign of insults, revealing that Nanako's stepfather left his wife and child to marry Nanako's mother, who was a cocktail waitress.