The new dream couple in the teachers' lounge, Frank Stimpel (Phil Laude) and Lisa-Britt (Sina Tkotsch), want to share their happiness: they offer a couples' dance class. But the class boycotts Stimpel's dance class, and Vice Principal Aminata Müller (Dela Dabulamanzi) supports his idea for a school ball. Yunus (Zejhun Demirov) and Sahra (Pegah Ferydoni) would prefer to boycott Lisa-Britt. But when the new, beautiful exchange student signs up for the class, even Osman (Mido Kotaini) and everyone else suddenly join in.

Stimpel (Phil Laude) doesn't think much of influencer or rapper as a career goal and tries to inspire his class's ambition. He absolutely wants all of his students to graduate, even though Vice Principal Aminata Müller (Dela Dabulamanzi) just shakes her head at the idea. Stimpel invites fund manager Rolf (Edin Hasanovic) to be a motivator and job role model. He arrives in a fancy sports car and doesn't really behave like a suitable role model. It's a good thing that at least the career counseling AI is showing heartfelt concern.

The new shared apartment situation causes conflict: Lisa-Britt (Sina Tkotsch) is doing everything she can to get Yunus (Zejhun Demirov) out of the apartment. At school, Stimpel's (Phil Laude) headphones have gone missing. He suspects Kira (Derya Dilber), sowing distrust in the class that spreads rapidly. When it becomes clear that his suspicions may not be true, the German tries to discreetly backtrack, making everything even worse. Fortunately, Kira and the others manage to make a fresh start. After all, who wants to be like Stimpel?

Stimpel, of all people, wants to educate his class. Everyone except him realizes that he has more to learn about sex than the students. Lisa-Britt (Sina Tkotsch) has evicted Yunus (Zejhun Demirov) from the apartment, leaving Stimpel (Phil Laude) all to herself. Osman (Mido Kotaini) is on the fast track to losing Kira (Derya Dilber). He wants to go viral with his first rap video and become a big star—with or without Kira.

Trip (Vincent Hahnen) tells of supernatural occurrences in the school basement. Dilara (Jansel Dogan) is convinced that her dead grandmother protects her and the class from the ghost with a magical eye. Stimpel (Phil Laude) thinks this is nonsense. He wants to prove that hauntings don't exist. But physics doesn't always provide the best explanation. Especially when emotions and Sahra (Pegah Ferydoni) are involved.

Lisa-Britt (Sina Tkotsch) is lacking fire in her relationship, and Frank Stimpel (Phil Laude) isn't getting it. He spontaneously passes off a surprisingly emotional love letter from Robert (Tim Alberti) as his own, temporarily maneuvering his troubled relationship with Lisa-Britt back to cloud nine. Student Robert wins the class "passionate expression" by a clear margin. This puts him even better than Trip, who, in a moment of weakness, decides to take a tutor in masculinity from Hausklaus (Milton Welsh), of all people.

The class is so poorly prepared for the final exam that, according to Osman (Mido Kotaini), they have only one chance to pass: they must steal the sample answers from the principal's safe. Unfortunately, he hasn't reckoned with teacher Stimpel (Phil Laude), who does everything in his power to prevent the theft. A bet turns into an epic battle for the ominous envelope. Is Sarah (Pegah Ferydoni) really teaming up with the class against Frank?

The big prom is coming up, and teacher Stimpel (Phil Laude) also has big plans: He wants to propose to his girlfriend Lisa-Britt (Sina Tkotsch) – at the school prom in front of the entire school, of course. But is Lisa-Britt really the right one, or should he just say "yes" to his new school, with all the consequences? Stimpel has to listen to his feelings, but that's never worked out well.