Sakura, a first-year student in Class 1-C at Kazehaya High School, belongs to Nagatoro's friend group. She possesses tanned skin, fluffy wavy platinum blonde hair held with white clips, brown eyes, and a slender build accentuated by a notably large bust. Her expression often carries a perpetually tired or delicate smile. Embracing gyaru fashion, she customizes her school uniform, leaving her shirt flap untucked and shortening her skirt. Her hair, originally chest-length, was later cut to shoulder length, occasionally revealing darker regrowth suggesting dye. Born September 4th in Hayama, Kanagawa, she is the eldest child with a younger brother and shares a close bond with her conservative-leaning father. Her middle-class background instills an understanding of hard work, leading to frequent part-time jobs and modest attire around family compared to school. Academically struggling, she requires supplementary lessons and often appears lazy or exhausted from balancing work and social life. Her interests include gaming, VR technology, yaoi, mythology, romance stories, and wrestling. Despite her laid-back demeanor, she exhibits unexpected athleticism in skiing, snowboarding, and running.

Personality-wise, Sakura presents as sweet-natured, calm, and level-headed, often acting as the peacemaker among her friends. She also displays a flirtatious, manipulative side described as "haraguro" (two-faced), clarified officially as stemming from a love of "being pampered" and "playing around" rather than malice. She excels at reading people and sowing jealousy among boys for amusement, using girlish poses to attract attention. She shows remorse when her actions cause harm and works to make amends. Holding a pacifist philosophy, she opposes retaliation and promotes reconciliation. Popular with boys, she has had multiple superficial relationships; Nagatoro notes she "lets them pitch but never lets them score," implying maintained boundaries. She also displays potential sapphic tendencies, showing excitement when viewing female characters nude.

Her story begins when she, Nagatoro, Gamo, and Yoshi discover Senpai's manga in the library. Part-time job commitments cause her absence from many early group activities, including summer events; during this period, she trims her hair. Upon rejoining the group regularly, she participates in light teasing of Senpai but transitions to supporting his relationship with Nagatoro after recognizing their mutual feelings. Key moments include helping Senpai remove a splinter (misinterpreted by Nagatoro), manipulating boys in the cafeteria to reclaim space, and enlisting Senpai's help to deter a stalker – a plan thwarted by Nagatoro's jealousy. After reconciling with the gaming club boys she manipulated, she joins their club and contributes to their VR corner during the culture festival. She consistently encourages Nagatoro and Senpai's bond, strategizing ways to boost Senpai's exhibit popularity during the art club's conflict with President Sunomiya.

Relationships include her unique nickname for Nagatoro, "Toro-chan," contrasting with others' "Hayacchi," and she addresses Senpai as "Senpai-kun." She relies on him for comfort during distress and mediates friend disputes. Her popularity with boys contrasts Nagatoro's exclusive interest in Senpai, highlighting differing romantic approaches.