Onegin's friend Lensky introduces him to Tanya, his fiancee's sister but Onegin flirts with his fiancee. Lensky challenges him to a duel; nobody stops them. Later, Onegin tries to seduce Tanya, but she's married. Onegin just doesn't get it.
A love triangle with Floria Tosca, a jealous diva; Mario Cavaradossi, her painter lover; and Scarpia, the authoritarian Chief of Police of Rome who wants Tosca for himself and uses his position to get rid of his competition.
The original story of the little mermaid. She is in love with a human and makes a deal with a witch to be able to be human. The deal is she has to convince him that she is his love but she has to give up Her voice to become human.