Entirely average high school student Kimito Kagurazaka is snatched out of his regular school and sent to an elite all-girl school in order to acclimate the students there to both boys and to the culture of commoners.

A day in Reiko's life demonstrates how good she is at everything she does, and how the other girls look up to her. Reiko throws Kimito a welcome party. Kimito introduces the girls to instant ramen in a cup.

While trying to settle into his new life, Kimito runs into child prodigy Hakua Shiodome, a shy girl who writes complex equations wherever she finds convenient, and Karen Jinryo, a self-taught sword master who challenges him to battle.

When Reiko invites Kimito to her room to join in a tea party with the other girls, Aika monopolizes Kimito's time, insisting that her party planning comes first. Kimito offers to help when Reiko inadvertently offends the rest of the class.

Hakua unexpectedly shows up in Kimito's room one morning, and the two of them make breakfast together. Reiko, Aika, and Karen grow concerned about how Hakua is garnering so much of Kimito's attention, and confront her.

The class takes a field trip to the newly-completed theme park "Shominland," where the students get to experience the commoner lifestyle. Kimito coaches the others through almost, but not-quite-authentic commoner activities.

Aika enjoys her newfound popularity by showing off her knowledge of a clothing store. Kimito helps Karen overcome her body image issues while trying on clothes. Aika asks Reiko to help her compose an apology text message to the class.

The Commoner Club members learn about maid cafés, and take over the cafeteria in a practical exercise to learn more about what maid café maids do. When Sakimori learns of Kimito's affinity for maids, she invites him to Hakua's lab.

Kimito gives Aika a yellow suit of the same style worn by Dandy Sakano, famous commoner comedian and inventor of the "Gets" gesture. When Kimito says that he misses having male companionship, the girls assume the worst.

Reiko offers to give Kimito one-on-one tutoring to help him with his flower arranging class. Reiko's mother and brother come to visit the school, with news that promises to change Reiko's life forever.

With Masaomi's help, the rest of the Commoner Club members arrive at the Arisugawa estate to break off Reiko's engagement. Kimito makes an impassioned plea, but ends up saying more than he intends.