Haruna is a high school student and classmate of Naruko "Anaru" Anjou and Aki. She maintains friendships within their school social circle. Her appearance features medium-length dark brown hair with parted bangs, brown eyes, full lips, and a distinctive purple bead bracelet always worn on her wrist. She wears the standard school uniform but consistently omits the pink bow common under her peers' collars. Haruna speaks bluntly and without reservation, frequently making indirectly insulting remarks, even towards close friends like Anaru and Aki. She joins Aki in teasing Jinta "Jintan" Yadomi upon his return to school after a long absence, suggesting "the power of love" motivated him. Though Haruna and Anaru were once regular companions, their friendship weakens as Anaru reconnects with the former Super Peace Busters. When Anaru faces school bullying over rumors about a love hotel visit, Haruna and Aki do not support her. This inaction reveals the superficial nature of their bond and Haruna's prioritization of social conformity over loyalty. Her name, meaning "spring," contrasts with Aki's name meaning "autumn," potentially symbolizing their interconnected roles in Anaru's social world. Haruna holds a minor role in the main series and does not appear in subsequent official media like the anime film sequel, stage readings, or other expanded materials.