Najimi Osana’s name originates from the Japanese term *osananajimi* (childhood friend), aligning with their self-designated role as a near-universal childhood companion to Itan Private High students, a reputation built through constant school transfers in their youth. Their gender identity is intentionally undefined, with biological sex unconfirmed. They fluidly switch pronouns, attire, and social personas—rejecting a suitor by identifying as male after previously claiming femalehood, for example. Their uniform merges a girls’ skirt with a boys’ necktie, while casual outfits blend jinbei robes or hoodies with shorts, emphasizing gender neutrality. Born April 1, Najimi possesses uncanny social prowess, instantly bonding with strangers and juggling multiple conversations. This contrasts starkly with their childhood failure to connect with Shouko Komi, an event so devastating it left them bedridden for a week. The trauma resurfaces in high school, causing nausea around Komi until reconciliation. Despite academic disinterest, their natural intellect secures high grades and the vice presidency. A catalyst for Komi’s social development, Najimi orchestrates events like maid cafes and study groups while mediating her interactions. Their mischievous nature drives playful exaggerations—boasting “millions” of friends—and fabricated scenarios for entertainment, though underlying loyalty to peers persists. Their dynamic with Tadano Hitohito balances relentless teasing with mutual trust, rooted in middle school history and knowledge of Tadano’s past. Physically, Najimi sports short lavender hair with cowlicks, a petite build, and features subtly shifting with artistic style. They consciously navigate their androgyny, opting for gender-neutral restrooms during group outings. Though compulsive lies and chaotic antics sometimes spark friction, their unwavering loyalty and knack for uniting disparate social circles solidify their narrative centrality. Key growth includes confronting Komi-related trauma, evolving from comic relief to a layered character grappling with social anxiety beneath their exuberance. Later arcs diminish their prominence as others develop, yet they remain pivotal in major events—exposing peer relationships via social media, for instance—while maintaining their role as a unifying force.