Kakeru Iimori, a second-year student at Private Tensho Academy, balances dual memberships in the Beautification and Theatre Clubs. His striking appearance features plum-colored hair—short and tousled at the front, cascading longer in the back—complemented by sharp green eyes and slender dark eyebrows. The academy uniform adheres to his signature style: an unbuttoned black jacket over a white undershirt, a green second-year tie, dark green checkered pants, and purplish-brown clasped leather shoes.

Exuding a serious, self-assured demeanor, Kakeru charms peers with his ladykiller reputation. Yet his defining trait remains an unwavering devotion to his younger sister, whose photos fill a cherished handbook he carries. This fixation drives him to aid others if it aligns with her interests, such as producing a promotional video for the music group Sakutasuke after learning of her fandom. Though diligent in these pursuits, he routinely skips Beautification Club duties, forcing juniors Hajime Kiriyama and Masaru Gohonmatsu to drag him to tasks—a dynamic he begrudgingly endures.

Club president Rei Ichijodani accommodates his overlapping commitments with flexibility, adjusting schedules or granting reprieves during hectic periods. Close friend Shiro Nanao openly mocks his sister obsession, sparking heated clashes, particularly over Shiro’s interactions with her. Hinata Mitsutsuka, another confidant, bonds with Kakeru over shared sibling adoration but grows weary of his relentless sister-centric chatter.

His musical contributions include performing "About me" on the ACTORS4 album, accompanied by drama tracks, while its music video became the first in the franchise to hit one million YouTube views.

Kakeru’s preferences highlight his priorities: savoring his sister’s cooking and valuing theatrical craftsmanship. His name, Kakeru (駆—"drive"), paired with Iimori (飯盛—combining "food" and "prime"), mirrors a duality of nurturing care and relentless ambition.