The episode 20 of The Classroom of a Black Cat and a Witch starts with Spica successfully claiming the ruby after pulling off a clever plan against the armored vulture. Even Leo is stunned that Spica managed to win after looking completely outmatched. Spica explains that once she realized she could not catch the creature in a straight fight, she stopped trying to beat it on its own terms. Instead, she brought the battle to an area where she could use her magic more effectively.
Her strategy involved exploiting the creature's maternal instincts. Spica created a moving wooden doll with Anima, had Voodie hide inside it, and used the fake hatchling to lure the armored vulture where she wanted it. The plan was risky and a little ruthless, but it worked. Spica admits that she feels bad about taking advantage of the creature, while Leo openly concedes that she outsmarted him. Their friendly rivalry continues, however, as both make it clear that the exam is far from over.
Spica is feeling confident after winning the ruby, but that confidence does not last long. She takes a nap to restore her magic power, only to wake up hours later and discover that the rankings have changed dramatically. Aria Aquarius is now in first place with 90 points, while Spica sits in fourth with 50. Spica is shocked that even after taking the ruby, she is still 40 points behind Aria.
Then Claude reveals the biggest remaining opportunity in the exam: the 100-point diamond has not been found. With nine hours left, anyone could still take first place. Spica immediately realizes that the diamond is her best chance to overtake Aria and rushes to solve the clue, which says that the diamond "sleeps in the heart."
Before she can figure it out, the entire island begins to shake. A massive section of land rises from the water, and the students learn that their island is actually an ancient giant turtle called Aspidochelone, which was transformed into an island by the founding witch Selene. Aspidochelone comes to life and moves at night, completely changing the shape of the exam area.
For Spica, the revelation makes the diamond's clue seem obvious. If the island is a living turtle, then "the heart" could mean its actual heart. She quickly notices that the center of the map points toward the cave where the terrifying worms live. Although she is scared, she refuses to hesitate because she knows other students will eventually reach the same conclusion.
Her race leads her to Chiron, who is also determined to find the diamond. Chiron has an even stronger reason to chase the prize. He has no points and sees the 100-point diamond as his only realistic way to jump to first place and prove his abilities to everyone. He knows returning to the worm-filled cave is dangerous, especially after he panicked and fled earlier, but he refuses to let fear stop him this time.
Spica and Chiron quickly discover that they are thinking along the same lines, and both head for the cave. Chiron even talks himself up as he races ahead, but the journey soon turns into another nightmare when he and other students encounter a swarm of enormous worms inside the darkness.
The group is suddenly attacked from all sides. The worms overwhelm them with numbers and spray corrosive bile through the cave. During the chaos, Astraea Libra protects another student and reveals her acid resistance, while Chiron begins thinking about how to use his magic without wasting another use of Voodie. The students have already used their emergency dolls twice, and using them a third time would mean disqualification.
For Chiron, the consequences are especially serious. He explains that because he already failed his midterms, failing this final exam would mean failing the entire school year. The pressure forces him to stop acting like a spoiled prince and finally trust his own abilities.
When the worms corner everyone, Chiron unleashes Sagittarius Magic: Updraft. He redirects the corrosive attack toward the ceiling, intentionally causing the cave to collapse. It sounds reckless, but Chiron has another spell ready. Using Tailwind, he carefully controls the falling boulders and guides them toward the worms while keeping his classmates safe.
The move works perfectly. The students escape the cave-in without serious injuries, and Chiron earns genuine praise for his precise magical control. He admits that control is the one thing he is truly confident about, even if it is not the flashiest talent. For the first time, his classmates openly recognize how skilled he is, and Astraea thanks him for protecting everyone.
Unfortunately, the cave turns out to be a dead end. Several students had made the same guess about the turtle's heart and searched the center of the island, but the diamond is nowhere to be found. Chiron is furious after risking so much for nothing, while the others scatter to search for another answer.
Spica, however, chooses not to follow them. She begins thinking more carefully about what has changed since Aspidochelone awakened. Her key insight is that the diamond might be located somewhere that was impossible to reach while the turtle was dormant. Since the magic map suddenly displayed the turtle's new shape, Spica tries giving the map more magic power.
Her gamble pays off. The map reveals a side view of the giant turtle and exposes a huge hollow beneath the cave. Spica notices that the space can be reached through the turtle's neck bone. The discovery gives her a completely new path to the possible location of the diamond.
There is a problem, though. Going deeper into the turtle means committing to a dangerous route, and there may not be enough time to turn back if she is wrong. Still, Spica knows that playing it safe will not help her catch Aria. If she wants first place, she has to take a chance that the other students have missed. With that decision made, she calls it her last big bet and heads into the unknown.
The journey also highlights what drives Spica. A brief look at her past shows that she is someone who refuses to quit once she decides to solve a problem. Even when she could not answer a question in class, she kept working at it instead of giving up. That same stubborn determination now pushes her deeper into Aspidochelone.
Inside the hidden hollow, Spica finds an entirely different world. The darkness is illuminated by strange glowing flowers, whose light comes from microbes that react when people approach. She also discovers a lake connected to the ocean, revealing just how enormous the living turtle truly is.
Then Spica spots something incredible in the darkness: a massive shape that looks exactly like a heart. Voodie begins to glow, confirming that the target is nearby. Spica realizes she has done it. The 100-point diamond is hidden inside the turtle's secret hollow.
After struggling through the exam and falling behind Aria, Spica finally has the chance she needs to change everything. She celebrates, convinced that taking the diamond will finally let her surpass her rival. But the victory is not hers yet. Just as Spica reaches the diamond, Aria appears. Aria admits that she followed her instincts and found the hidden location as well. With the biggest prize in the exam standing between them, neither girl is willing to back down.
Episode 20 ends with Spica's desperate gamble paying off—only for her final obstacle to become a direct confrontation with the strongest student in the rankings. The diamond is within reach, but Aria is standing in the way, setting up the next episode's long-awaited showdown: Spica vs. Aria.
The Classroom of a Black Cat and a Witch Episode 20 delivers one of the exam arc's strongest episodes by combining clever problem-solving, comedy, character growth, and a major cliffhanger. Spica's ruby strategy proves how much sharper she has become, while Chiron gets his best moment yet by turning his precise magic control into a lifesaving advantage. The giant turtle reveal also expands the exam's world in a fun and surprising way, and Spica's discovery of the hidden hollow shows why she cannot be counted out. Most importantly, the episode ends exactly where the competition needed to go: with Spica finally finding the 100-point diamond, only for Aria to arrive and challenge her for it. The setup for Spica vs. Aria makes the next episode impossible to ignore.
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