Sayuri Osanada, a high school student with a petite frame and youthful features evoking an elementary schooler, sports vibrant pink hair in twin ponytails and bright blue eyes. Her outfit—a white dress shirt beneath a pink vest fastened with a red bow, a red-and-black plaid skirt, white socks, and brown shoes—mirrors her blend of innocence and boldness. Though she projects a cheerful facade, her temper ignites into explosive violence, echoing Ranna’s untamed ferocity.

As Amori High’s bancho, she reigns as the school’s undisputed physical powerhouse. Initially antagonistic toward Rokudou due to his sudden sway over delinquent girls, her resolve crumbles under the influence of his hereditary charm, sparking an infatuation that drives her to abandon delinquency. She pivots to aid Rokudou’s mission for peace, channeling her combat expertise to neutralize threats while reclaiming a place in mainstream school life.

Her name, blending “small” (小) and “lily” (百合), underscores her delicate stature and symbolic purity, while her surname, fusing “young” (幼) and “rice paddy” (田), reinforces her childlike aura. Relationships like her tentative bond with Mizue Tsuyukusa trace her shift from solitary enforcer to collaborative ally, bridging social divides.

Though her past remains sparingly detailed, her arc focuses on transforming from a feared delinquent leader into Rokudou’s steadfast protector. She employs her combat prowess and reformed reputation to mediate disputes, uphold order, and defend his vision, cementing her role as both a moral anchor and tactical asset within his coalition.