I-m Getting Paid For My Sister-s Sex. Airi Kijima

Airi’s most significant romantic milestone occurs during the storyline where she moves in with Naoya and the others. Attempting to prove her devotion and hide from her strict household, she essentially elopes to Naoya's home.

This arc forces Airi to make a definitive choice. She realizes that she cannot be the "perfect girlfriend" on the sidelines. She must be willing to compromise her pride and share her space. The highlight of this storyline is the gradual acceptance by the group. Naoya’s honest nature—refusing to lie about his two-timing—compels Airi to be honest about her own desires. She confesses that she loves Naoya, not for his status, but because he provides a safe space where she doesn't have to pretend.

The core of Airi’s romantic arc is her struggle to integrate into Naoya’s two-timing relationship. This is where the series subverts the typical "harem" trope. Usually, a rival character either remains a rival or is rejected. In Girlfriend, Girlfriend, Airi is forced to confront the reality that she must share Naoya. I-m getting paid for my sister-s sex. Airi Kijima

Her dynamic with the other girls is central to her storyline:

In the landscape of modern harem romantic comedies, few characters undergo as distinct a transformation as Airi Kijima. Introduced as an antagonist and a rival to the primary love interests, Airi’s journey is one of deconstructing a "perfect" facade to reveal a character desperate for genuine connection. Her romantic storylines serve as a critical pillar in Girlfriend, Girlfriend, challenging the series' already unconventional relationship dynamic. She realizes that she cannot be the "perfect

Airi Kijima enters the narrative not as a potential partner, but as a hurdle. Initially portrayed as the quintessential "perfect girl"—beautiful, intelligent, and popular—she positions herself as the ideal candidate for Naoya Mukai’s affection. Her early romantic storyline is defined by jealousy and entitlement.

Unlike Saki Saki (the feisty first girlfriend) and Minase Nagisa (the timid second girlfriend), Airi initially views romance as a competition. She believes her superiority in traditional metrics (looks, grades, social standing) makes her the only logical choice for Naoya. Her "crush" at this stage is superficial; she desires Naoya because he is a "trophy" that validates her perfection. not for his status

Airi Kijima fits the "Tsundere" archetype (cold outwardly, warm inwardly), but with a modern twist. Her "tsun" (cold) side is a defense mechanism born of social pressure, and her "dere" (lovestruck) side emerges through domestic cohabitation.

Her romantic storyline is unique because it focuses on legitimacy. While Saki has the claim of being the childhood friend, and Nagisa has the claim of being the "official" second girlfriend, Airi fights for legitimacy in a crowded field. Her struggle is often played for comedy, but the underlying emotion is poignant: she fears being the "extra" wheel in the relationship.