At the mall, Leni does her job at Reininger's. After helping out Scoots, Ms. Carmichael tells Leni to come to the break room. Upon entering, Leni is greeted by a cake on the table and Ms. Carmichael announces that Leni has been named employee of the month, where Miguel and Fiona congratulate her. Later, Rita arrives to pick up Leni. As the two head home, Leni tells Rita of her accomplishment, and Rita, saying how proud she is, asks if she's up for the task of babysitting her siblings, since she and Lynn Sr. are going to a Renaissance fair. Despite having doubts, Leni is assured that she'll do fine.
At the Loud House, Rita and Lynn Sr., wearing Renaissance outfits, and Lily, wearing a knight's helmet, depart for the fair. The moment the three leave, Leni is suddenly bombarded by problems she must solve, such as Lynn and Lola fighting over a dollar, Lana being sprayed by a skunk, and Lucy putting a human spleen in the fridge. Leni becomes so overwhelmed by the amount of problems, that she freezes from shock. When Lola comments that Lori would've solved their problems easily, Leni regains consciousness and realizes that Lori might help her. Calling up Lori, who is busy at Fairway, Leni asks for her help and Lori reluctantly agrees. Using advice from Lori, Leni solves the feud between Lynn and Lola by splitting the dollar in half (by which she takes a pair of scissors and cuts it in half), and giving Lana a tomato soup bath to get rid of her stink. When Leni asks if she can relax, Luna says that Luan turned their room into a comedy club. Calling up Lori again for more advice, Leni, wearing a firefighter's outfit, tells the visitors to leave, saying that the building is in over-capacity. The moment the visitors leave, Lincoln and Clyde ask Leni if they could watch a scary movie, and take Leni's act of freezing as a yes. Leni tries to call Lori for more help, but because she called during the middle of a class lecture, Lori's phone is confiscated by her professor, leaving Leni to solve problems on her own. When more problems break out, Leni exits the house to scream out her frustrations. Suddenly, Mr. Grouse comments what's going on in the house, since their antics have distracted him long enough for him to damage his garden. When Leni tells him that she's trying to keep it under control, Lincoln tells Leni that the internet is out. When Mr. Grouse tells them the correct way to fix it, Leni discovers that Mr. Grouse could help her.
After fixing up the wi-fi router, Leni continues to ask for Mr. Grouse's help, as he helps her bulldoze some sand Lynn brought home out of the house. However, the problems continue to arise, as Mr. Grouse takes a nap in the living room, Lisa making a corrosive fruit punch that burns a hole which Mr. Grouse falls into, Luna turning her and Luan's room into a rock club, Lucy needing help cleaning blood, and Lincoln and Clyde being too scared to turn the movie off. Completely overwhelmed, Leni runs off to a corner of the house to escape the madness. Suddenly, she gets a call from Fiona and Miguel asking if she wants to join them at the spa. When Leni declines, saying that she can't get her siblings under control, they tell her that she should use her store sense to solve their problems, like treat the siblings as customers.
Taking her friends' advice, Leni orders her siblings to form a line and she'll solve their problems one at a time. She manages to stop Lisa's fruit punch from preventing more corrosive damage, reads a children's book to Lincoln and Clyde to calm them down, shuts down Luna's rock club, gives Lynn and Lola $5 each, and tells the skunk to leave. The moment Leni finishes all the tasks, Rita, Lynn Sr. and Lily arrive back home, much earlier than usual, as Lynn Sr. states that the Renaissance fair is vegan-only, and since they brought only meat, they couldn't stay. Rita is impressed that Leni was able to keep the house intact (albeit one giant hole in the living room). Lynn Sr. rewards her with a leg of mutton, whom she gives to Mr. Grouse, who is still stuck in the hole.
Lily has no lines in this episode.