Ep 9. Pandora of Eternal Return -Pandora's Box-

The ninth episode of Steins;Gate season 2, titled Pandora of Eternal Return -Pandora's Box-, follows the main protagonist Okabe Rintaro, as he tries to get his hands on an important time travel theory paper that will help him save his friends and undo all the damage caused by his time machine experiments.

In this episode, Okabe meets Dr. Leskinen, a time travel researcher who had previously saved him from being caught in a time paradox during his "Time Leap" experiment. Leskinen tells Okabe about the "Pandora's Box", an ultimate time machine experiment that will change the course of history forever. The scientist also reveals that he has the key to this experiment, which is the very time travel theory paper that Okabe desperately needs.

Meanwhile, Okabe's friend Mayuri is dealing with her own personal problems, as she struggles to come to grips with the fact that she is stuck in a time loop and that she may not be able to escape it. Mayuri confides in Okabe, telling him how she feels like she is losing her mind, as she relives the same day over and over again.

Okabe tries his best to comfort Mayuri and assures her that he will find a way to put an end to the time loop, but he knows that he cannot do it without the time travel theory paper. He decides to approach Dr. Leskinen and asks him for the paper, but Leskinen refuses to give it up so easily.

In order to convince Leskinen, Okabe puts on his "mad scientist" persona and tells the scientist that he is going to use the time machine to save the world from destruction. He promises to use the paper to create a perfect world, where everyone is happy and free from pain.

Leskinen is intrigued by Okabe's proposal and agrees to give up the paper, but only under one condition – Okabe must participate in the ultimate time machine experiment, the Pandora's Box. Okabe agrees to the deal, knowing that this is his only chance to save his friends and undo all the damage caused by his experiments.

The episode ends with Okabe and Leskinen heading to the laboratory for the experiment, with Okabe determined to make sure that he comes out victorious and changes the course of history for the better.

Overall, the ninth episode of Steins;Gate season 2 is a tense and emotional installment in the series, as the main protagonist races against time to get his hands on the one thing that can help him save his friends and undo all the past mistakes. The episode does a great job of building up the tension and anticipation for the ultimate time machine experiment, leaving viewers on the edge of their seats until the final moment.