Episode 5 begins with a monologue by Arthur Bersford, a young man who once dreamed of becoming a knight like his father, known as the "Untouchable Knight." However, Arthur's unique ability to make plants grow led him to abandon that dream and instead become a farmer.

The episode then shifts to Arthur's home, where he and his father are practicing swordplay. Arthur's father, Rodrick, is slightly tipsy from drinking with his friend Clark, but they continue their training nonetheless. During their session, Arthur asks about Princess Pride and expresses his interest in her strength.

The scene transitions to a flashback showing how Arthur's father saved him from the unstable ground of a cliff, committing a brutal betrayal in the process. The memory is interrupted by Princess Pride's concern for Arthur, and her siblings, Prince Stale and Princess Tiara, reassure her that he is fine.

At the castle, Princess Pride returns a borrowed cloak to Prince Stale and encounters Arthur's father, Rodrick, and his friend Clark. They discuss Arthur's training and his father's affection for him. Arthur arrives to return something his father left behind and is invited by Prince Stale to train with him.

Prince Stale and Arthur begin their training, and Stale expresses his desire for Arthur to become a knight as soon as possible. He explains that he wants Arthur to protect Princess Pride, whom he sees as vulnerable despite her strength. Stale shares his vow to protect his sister and asks Arthur to be the sword that shields her from the powerful.

Arthur agrees to train with Stale and teach him what he has learned from his father and the knights. They build a bond of trust, and Arthur advises Stale to drop his forced smile, as he finds it unsettling. They continue their training, both determined to grow stronger for Princess Pride.

Throughout the episode, the narrative focuses on Arthur's journey from farmer to aspiring knight, his relationship with his father, and his connection to the royal family.