Yet another amazing world building episode while still giving the audience a lot to enjoy from. Never would you expect to look back to Eris training arc, most show would just show the training arc while eris is fighting a monster in the future. With Mushoku you can't help and just cry "I need more!". Holding back on reading the novel has been one hard urge. The copium of Nina was funny in the beginning, and yet again, Mushoku prove that every character is a character. They behave and learn and grow. That's how you get dynamic interesting relationship in your story.