Nico proudly tells Inge about his upcoming apprenticeship at Yara's bike shop, so Max and Tarek tease him about how hard he'll have to work. But Nico isn't worried; after all, surely he can take a siesta when the weather's hot...

Yara and her landlord are talking about climate change. Yara is appalled by how some people are so indifferent to the issue.

The environment concerns everyone—including these roommates! How can people be convinced to recycle and sustainably change their behavior as consumers? The four discuss what could be done.

Lisa wants her class to try giving up plastic for a week. She quickly realizes that it's more challenging than she first thought, but luckily, some sweet treats come in cardboard packaging too.

Lisa and Selma are chatting about green energy at Das Marek when Yara shows up and tells them about the flea market she's organizing. This is the first time Yara has met Selma, though she knows that Nico has a big crush on her.

Bookshop owner Oskar isn't exactly happy when his brother suddenly appears. He is as skeptical of his brother's intentions as actress Yvonne Klosterfeld is of the notion of true love.

Oskar has a crush on his neighbor, a famous actress, but only has contact with her through the items she gets sent to his store.

Oskar finds out that he is terminally ill and only has four weeks to live. Meanwhile, Yvonne's sponsored child from Zimbabwe shows up at her front door.

Oskar's brother asks him for money, not knowing that Oskar is terminally ill. Meanwhile, Yvonne Klosterfeld's sponsored child from Africa seems to have her own plan for her time in Germany.

When Vilo comes to pick up the Klosterfelds' mail, Oskar gives her a letter to deliver to Yvonne.

Oskar makes Yvonne a very bold offer in an attempt to live his remaining weeks to the fullest.

Oskar tells his brother that he won't be giving him his money. He then visits Yvonne's house, but is quite shy around her.

Yvonne and Oskar bond over a reading of Rainer Maria Rilke's "Der Panther." Meanwhile, his brother continues to make big plans...

Yvonne's mother shows up and she tells him about the arrangement with Oskar. They begin to fight, prompting Oskar to leave quickly.

Yvonne auditions for a role that has parallels with her own life, but the casting agents are skeptical of her.