Elly and Ava are happy until Ava is offered a place at a sports school in Stuttgart. Luis and Milo are the first to feel Suki's sharp analysis. Joshua helped Dilara get into the Einstein Gymnasium and has a crush on her. Malik notices and teases him. And Dilara has plans of her own.

Milo plans a show and secretly uses Ruby's technology, which he accidentally destroys. Ruby is furious, but Malik tries to mediate between them. After a botched apology, Milo finally gets a chance to perform with his hand puppet, Socke. Aurelia shows Hugo her pen-and-paper RPG but is overwhelmed by his over-enthusiasm. Anh Thi is desperate because she can't find a document.

On Massuda's farewell tour, Elly realizes how much she cares for Einstein. At the train station, she has to decide: Will she follow Ava for love or stay with her friends? Thanks to Luna's support, Frida allows herself to feel anger and grief for the first time over the flood disaster on her family's farm and finds new hope. Suki impresses Karl with her keen eye for interpersonal relationships and shows him the art of observation.

Sami and Luna experience a bizarre day out together, encounter a strange fortune teller, and cuddle up in bed that evening, which suddenly overwhelms Sami. Meanwhile, Aurelia pulls Hugo, Milo, and Karl into her fantasy world of Auria. Together, they embark on an exciting pen-and-paper RPG adventure. Massuda and Luis are setting up the new club and end up clashing quite a bit in the process.

Massuda and Luis repeatedly clash over the club's design until a paint fight brings a surprising turn of events. Confused, they both distance themselves, but the waiting guests interrupt any attempt at reconciliation. The band "Rocket Science" is scheduled to perform at the club, but with vocals. When Ruby learns who the new lead singer will be, she is disappointed. Elly misses Ava, and Maxi desperately tries to distract her.

Malik and Joshua become rivals at the club's opening because they both have a crush on Dilara: Joshua tries to impress her with grand promises, while Malik gives her genuine compliments and Tahmi confides in him about his insecurity. Meanwhile, tensions are running high in the background: Ruby is jealous of Dilara, Anh captivates the audience, Frida's climate plea is moving, and there's an awkward tension between Luis and Massuda.

Orkan returns to Einstein and accompanies the graduating class to their career counseling session. While Massuda and Joshua begin making plans for their future, Marlon remains uncertain. But Orkan already has an idea of ​​how he can help Marlon. Meanwhile, Suki helps the Einstein students with conflicts and self-discovery until she meets Joshua and Elly. Luna struggles with Frida's climate rules and gets caught breaking them.

Sami starts to have doubts: Does Luna want more from him than he wants from her? Torn between uncertainty and well-meaning advice from his friends, Luna also becomes nervous, until they both realize that openness is the only way forward. Meanwhile, Maxi stumbles through what should have been a lucky day full of mishaps, and Aurelia struggles to finally get her Auria team together. But nothing goes according to plan until an unexpected moment.

Joshua wants to impress Dilara and presents Director Chung with an exaggerated vision for the club – but to no avail. Ashamed, he lies to Dilara and desperately tries to raise money. Marlon also goes overboard: During police training, he injures himself because he doesn't listen to his coach, Sami. Despite their argument, Suki, Aurelia, and Anh Thi realize: Happiness means something different to everyone, but sometimes it's the same.

Luis carelessly wastes energy until Sami challenges him to a climate challenge: enduring a day of extreme temperatures. Can he survive the heat on a warm summer day wearing thick winter clothes? While Luis struggles, Elly saves Massuda's art project. She sews all night for it. Ruby wants to sing her song, but Dilara passes it off as her own.

Zech and Hugo involuntarily swap bodies: Hugo has to manage the daily life of a teacher, and Zech the responsibilities of a student – ​​chaos is inevitable. Meanwhile, Frida and Luna are working on their self-sufficient garden. They accidentally cut the internet connection and hope that Ms. Schiller doesn't notice. Just as Frida is about to launch her next climate action, Luna intervenes. Luis is still struggling with his feelings after kissing Massuda.

Thanks to Sami's aunt, Marlon is doing a police internship, which starts off rather dull in the office – until a report of a stolen bicycle comes in. Despite warnings, he investigates and experiences a surprising turn of events. Meanwhile, things are tense in the band: Ruby confronts Dilara about a cheeky post, and Malik is torn between loyalty and infatuation. Karl is fighting for Maxi's attention, until a sad piece of news overshadows everything.

Maxi faces a difficult farewell, but with Luna, Elly, and Karl by her side, she finds support and strength. While she makes another decision, the situation at the club escalates: Milo is overwhelmed, Joshua is irritable, and Luis gets into another argument with Massuda - a chaotic mix of stress and misunderstandings where no one notices how one small mistake triggers another, and suddenly flames threaten the club.

Elly distracts herself from her longing for Ava with sewing and sweets. Lee's sudden influencer hype brings her success, but also work. While she avoids an honest conversation with Ava, excitement is brewing at Einstein about a secret band gig at NEON. Sami is unsure if he's ready for his first time and gets help with the preparations from his friend Luis.

Suki is so busy helping everyone at Einstein that she overlooks her own limitations and stumbles between problems, homework, and Joshua's emotional turmoil - until a fateful mishap occurs. While Sami and Luna realize on Luna's birthday that openness is more important than perfection, the heroes of Auria find themselves caught in a dark game where returning home suddenly seems a distant prospect.

Massuda is worried about Elly and realizes that her friend is struggling with more than just exhaustion. A failed attempt to help makes them both reflect, until Elly opens up and seeks support. Ruby and Malik discover common ground and grow closer during the trading game, while Dilara and Joshua clash. Aurelia is homesick and alienates her fellow players, but with Frida's help, she finds her way back into the game.

Suki is annoyed by Ms. Amani's wellness exercises. Forest bathing and body scans aren't serious methods for solving problems in her eyes. Meanwhile, a viral band video generates excitement online but angers Dr. Berger. A dispute over its release splits the band. At the club, the tension between Massuda and Luis leads to a clarifying conversation when Milo and Joshua leave them alone.

Malik helps Tahmina bake fortune cookies. While pondering the messages together, the two make a good team, and Malik has an idea. Frida, exhausted from lack of sleep and the constant stream of bad news, retreats to the school garden and collapses. Marlon trains hard for the aptitude test and impresses PE teacher Hauser, who gives him unexpected praise.

Elly surprises Joshua with her strategy for avoiding sweets. He's impressed by his sister and surprises her in return. Meanwhile, Dilara wants to apologize to her band, but it's only with Malik's help that she finds the right words. Aurelia has to perform a planned choreography with Frida alone in gym class and is spontaneously joined by Anh and Suki.

Milo finds Socke's charred remains and faces the prospect of saying goodbye. Marlon encourages him to carry on without his constant companion, but Milo's quirky sense of humor drives him crazy. Meanwhile, Tahmina's matchmaking mishap throws Malik's feelings into turmoil: Malik accidentally ends up at the cinema with Dilara, while Ruby unknowingly waits for her chance. Luna learns to give Frida space and rediscover the meaning of friendship.

Massuda fights in vain for NEON and stands protectively in front of Luis and the others, even though the room remains lost. Malik tries to resolve the confusion between Dilara and Ruby, but his insecurity hurts them both. Meanwhile, Hugo surprises Mrs. Miesbach with a fantastic presentation about how the future is created from imagination.

The uncertainty surrounding Frida's disappearance is troubling Luna. She persuades Sami to visit Frida at her parents' farm. While Sami experiences country life, Luna learns how Frida is regaining hope. At boarding school, Marlon and Karl are searching for a topic for their happiness module. While Karl is mixing his brain-power smoothie, the power keeps cutting out. They both agree: if anyone can find the cause, it's them.

Joshua gets lost in Luis's enigmatic mood box: what starts as a harmless experiment becomes a vortex of beats, light, and ever-increasing costs—until Joshua is suddenly broke. While he tries to keep up appearances, Ruby struggles with her solo deal, Dilara's news, and growing guilt. Meanwhile, Massuda saves the Glückissage with a surprising idea, breathing new life into the entire project.

Milo, Karl, and Hugo plunge into the Auria finale: puzzles, traps, and unexpected setbacks make the game surprisingly tricky. While they fight for every move, Luna and Sami prepare for Frida's return—but stumble from one mishap to the next. Meanwhile, with Suki's help, Malik tries to sort out his emotional turmoil and realizes what truly matters.

Milo learns responsibility in his own way: Despite trouble with teachers and grades, he works with Suki and Anh's help on a vision for fairer education. Meanwhile, Joshua and Marlon engage in a heated duel over the graduation speech, which Massuda expertly moderates. Aurelia uses her time with Frida to launch a creative happiness project that aims to unite all the Einstein girls.

Karl and Suki embark on a joint journey into Hugo's future project, which brings them closer together. While Ruby's seemingly finalized solo contract leads to her definitive break with the band, Malik struggles with his guilt towards Dilara and Ruby. Massuda faces the challenge of her graduation speech but unexpectedly receives support that gives her courage.