Ep 12. Zero Treasure

Louise and her classmates have a day off, so they decide to go to the beach. However, Saito is missing, so Louise decides to go look for him since he's been acting strangely since they entered the treasure room. When Louise finds Saito, he tells her that he found a treasure map in the room, and wants to go find the treasure.

Louise agrees to help Saito find the treasure, but only if he does something for her in return. Saito agrees, and they set off to find the treasure. Along the way, they encounter many obstacles, including a group of pirates who are also searching for the treasure.

Despite the obstacles, Saito and Louise eventually find the treasure, but they are ambushed by the pirates who want to take the treasure for themselves. During the fight, Saito discovers that the treasure is actually a magical stone. In the end, Saito and Louise manage to defeat the pirates and keep the magical stone, which they decide to keep a secret.

Back at school, Saito is feeling guilty about keeping the stone a secret from Mr. Colbert, but Louise tells him that they have to keep the stone hidden since it's too dangerous in the wrong hands. Meanwhile, Guiche is disappointed that they didn't find any gold, while Kirche is happy that they found something even better than gold.

Later that night, Louise is unable to sleep because she's worried about the magical stone. She goes to see Saito, who is also awake. Saito confesses his feelings to Louise and kisses her, but Louise slaps him. However, she quickly changes her mind and they kiss again.

The next morning, Saito wakes up to find that Louise has left a note saying that she has gone to see Mr. Colbert about the magical stone. Saito panics and runs to find Louise, but he is stopped by Kirche who tells him that Louise is safe and that Mr. Colbert is taking care of the stone.

Later, Mr. Colbert tells Saito and Louise that the stone is actually a "Philosopher's Stone," which can be used to perform incredible magic. Mr. Colbert tells them that the stone is too powerful to be in the possession of anyone, and that it will be taken to the Royal Court soon for safekeeping.

The episode ends with Saito and Louise looking at the ocean, realizing that they will soon be going back to their respective worlds. However, they both know that they will always have each other, no matter where they are.