Episode 12 of Nanatsu no Maken ga Shihai Suru (Reign of the Seven Spellblades) is an exciting episode full of despair, decisions, and the will to save a friend. The episode begins with the Kimberly student council, led by Godfrey, preparing to enter the labyrinth to rescue the kidnapped students and stop Ophelia Salvadori, who has been consumed by her own spell.

Back at the academy, the friends of the missing Pete grow increasingly worried. Guy, in particular, is frustrated and wants to take action. Nanao tries to calm everyone down, explaining that getting emotional won’t help. Chela reveals her plan to go into the labyrinth alone to rescue Pete, which Oliver firmly opposes. Ms. Miligan intervenes and offers to train them to increase their chances of saving Pete. In return, Katie will become her research partner once everything is over. Katie accepts the offer, much to Oliver’s dismay.

Ms. Miligan takes the group into the labyrinth for training. They encounter a large magical beast, and Ms. Miligan uses the opportunity to teach them valuable lessons about fighting such creatures. She emphasizes the importance of understanding the enemy, avoiding drawing its attention, and fighting with a plan in mind. The group decides to work together and take these lessons to heart.

Meanwhile, the missing Marco is found and joins the group. They also meet Kevin Walker, the so-called Survivor, who gives them a map of the labyrinth’s third level but cannot locate Ophelia’s workshop. The group continues their journey, now armed with more knowledge and a renewed sense of purpose.

The episode ends with a glimpse of Pete, who appears to be in a dire situation, raising the stakes for his rescue. The title of the next episode, "Possibility," suggests that the group’s newly acquired skills and determination could play a pivotal role in the events to come.