Haruna Sairenji, a 16-year-old high school student, sports blue-violet hair styled in a bob cut accentuated by a red vertical hairpin on the left side. Her purple eyes complement a slender 160 cm frame, weighing 50 kg, with measurements of B79, W56, H82.

As the younger sister of Akiho Sairenji and daughter of Fuyuhiko and Natsumi Sairenji, she shares an apartment with her sister due to her parents’ demanding careers.

During her early teens, Haruna harbored unspoken feelings for Rito Yuuki, a compassionate classmate, but hesitated to confess, fearing rejection. Her friendship with Lala Satalin Deviluke, who shared feelings for Rito, deepened her emotional conflict. Encouraged to voice her heart, Haruna confided in Lala, forging a bond of mutual respect and acceptance.

A left-handed member of Sainan High’s tennis club, Haruna balances responsibility, kindness, and patience, often overlooking Rito’s accidental indiscretions. Beneath her gentle demeanor lies latent superhuman strength and mastery of blunt weapons, triggered by fear.

Gradually embracing assertiveness, Haruna openly expresses her affection for Rito, embodying a journey of self-discovery intertwined with themes of friendship, love, and resilience.