Movie
Description
Ryunosuke Chiba is a student in Class 3-E of Kunugigaoka Junior High School, distinguished by his black hair and long bangs that conceal both his intense, maroon-colored eyes and also function as a gun sight to aid his marksmanship. Standing 172 cm tall, he carries himself with a serious, stoic, and calm demeanor, often compared to that of a working adult. He speaks sparingly but notices fine details in others, offering quiet encouragement to classmates in need. His temperament aligns with Rinka Hayami's, though he is even more reserved in speech.

He favors mathematics, especially spatial calculation, which supports his shooting skills, and shows notable academic improvement, rising from 91st to 9th place in class rankings. Biology is his least favorite subject. His hobbies include triangulation and listening to Japanese hardcore punk music, and he enjoys hard-boiled eggs.

As the top male marksman in Class 3-E, he specializes in long-distance shooting and spatial calculation, earning praise from professional assassins. However, his balance and kinetic vision are weaker than Hayami's, making unstable terrain challenging. His assassination aptitudes rate highly in execution and technique, but lower in strategy and negotiations.

He participates in key events such as the Assassination Island arc, where he overcomes a fear of failure to succeed with class support, and the Civil War arc, where he is eliminated after being outflanked. Previously a member of the Light Music Club, he maintains a steady partnership with Rinka Hayami due to their complementary skills. Their friendship endures after graduation, with Hayami assisting him in finding employment. He also interacts with classmates, encouraging Karma Akabane academically and calmly sidestepping Taiga Okajima's perverted influences. He taught the fixed artillery Ritsu to play shogi but was eventually consistently defeated by her.

Seven years later, he becomes an architect, fulfilling his goal and applying his skills to assess the durability of the old Class 3-E classroom during repairs. He maintains connections with former classmates.

His training code name was "Adult Game Protagonist," referencing his hairstyle. He has three younger sisters and blood type A. Officially, he received high ratings in long-range assassination and characteristic skills, with moderate scores in physical strength and academic ability.