Episode 15 (Anime)

Last Song (聖歌（ラストソング）, Seika (Rasuto Songu)) is the fifteenth episode of the  anime series.

Summary
Pete manages to send a distress signal, however after it he collapses. As he loses consciousness, he doesn't want to die and wishes to see his friends again. Oliver and his group then arrives, happy to see that Pete is alright. However, Ophelia also returns. She realizes that Pete is a reversi. Vera explains that since they are here only for Pete and Ophelia doesn't need him since he is a reversi, Vera wonders if Ophelia can let them go and she can continue doing whatever she is doing. Ophelia explains that she has already reached the pinnacle of Salvadori magic and was just looking for a place to begin. As she starts a chant, Vera tells the rest to quickly stop her incantation. Oliver and the rest try, however they fail to stop her. Ophelia then finishes her incantation creating a Grand Aria, a dome that is essentially another world and where the caster's laws reign supreme. Stacy and Lynette also show up, making Michela realize that they are trapped with them. Vera explains that they are likely in Ophelia's womb and that she rejected the goal of creating the perfect lifeform and came up with her own conclusion, the endless creation of chimeras, an infinite trial and error. The only way they can leave is either if Ophelia lifts the spell or she dies.

While Vera and Michela focus on the offense, Oliver and the rest focus on protecting them. Vera provokes Ophelia, telling her that her first love Alvin was out of her league. As she attacks Ophelia, Ophelia manages to capture her, but Vera petrifies her. However Ophelia breaks the petrification, stating that petrification curses stopped working on her long ago. Vera continues to mock Ophelia, which only angers Ophelia, who then starts to twist and pierce Vera, leaving her unable to move.

Oliver and the rest then change their plan and start fighting the chimeras to give Nanao an opening to kill Ophelia. Eventually, Nanao is in striking distance, however seeing Ophelia cry, she hesitates and ends up getting knocked down. Nanao then apologizes to Oliver, explaining that Ophelia is just a child and she cannot turn her blade against a crying child. Michela apologizes to Pete that she couldn't protect him, but he takes out his sword and goes to her side to fight alongside her. Watching all of them, Ophelia wonders when was the last time someone held her like that or shared his feeling. She regrets of what she is as that only led to her to being alone. A singing is the heard and part of Grand Aria's walls break. Carlos and Alvin then come in, apologizing for being late and noting they came for Ophelia. Ophelia tells them to not approach her, but Carlos ignores her. They remove their tattoo on their neck and start singing, causing the Grand Aria to continue to crumble. Alvin explains to Oliver that Carlos and Ophelia's families have a pact. Carlos was send to be with Ophelia just in case she was ever consumed by her spell. Oliver realizes that they are a castrato and Alvin confirms that such enchanted voice can only be gained by removing the male gonads while the person is still a child. Because of that, they also have resistance against all types of sexual magic. Carlos hugs Ophelia and apologizes, since they promised to make her smile, but couldn't do it. Carlos tells her that they will always love her. Ophelia hugs them back, but states she "hates" them. Alvin then says goodbye to Carlos, after which Carlos and Ophelia disappear, alongside the Grand Aria.

The students then return to the surface. Since what happened with Ophelia is a normal thing for the school, people quickly stop talking about it and return to their normal school life.

Characters

 * Pete Reston
 * Lesedi Ingwe
 * Tim Linton
 * Stacy Cornwallis
 * Lynette Cornwallis
 * Carlos Whitrow
 * Alvin Godfrey
 * Gwyn Sherwood
 * Shannon Sherwood
 * Oliver Horn
 * Nanao Hibiya
 * Michela McFarlane
 * Vera Miligan
 * Ophelia Salvadori
 * Cyrus Rivermoore
 * Guy Greenwood
 * Katie Aalto
 * Fay Willock
 * Tullio Rossi
 * Richard Andrews
 * Teresa Carste
 * Joseph Albright
 * Marco
 * Milihand
 * Vanessa Aldiss
 * Esmeralda
 * Frances Gilchrist
 * Enrico Forghieri

Light Novel-Anime Differences

 * In the novel version of the flashback to third-years Godfrey and Whitrow confronting Ophelia, Ophelia was visibly pregnant with her only known human child.
 * The denouement sequence where the rescue parties return to the surface and reunite with their friends is original to the anime.