Yasuo Tanigawa attends Benibane High School and serves as the loyal lackey and best friend to the school's banchō, Katsutoshi Imai. He respects Imai wholeheartedly and has made a lifelong commitment to follow him, frequently involving himself in Imai's troubles. Tanigawa's small physical stature makes him a common first target in confrontations, leading to regular bullying. Despite this disadvantage, he possesses a strong spirit and unwavering determination, which sometimes allows him to intimidate opponents or stand his ground in challenging situations. Primarily a comedic foil within Imai's group, Tanigawa often participates in absurd or ill-fated schemes. These include digging holes intended to trap rivals, only for the plans to backfire on Imai's group. His dialogue reflects a submissive yet dutiful attitude, such as voicing doubts about impractical decisions while ultimately complying with Imai's requests. Tanigawa shares a strong bond with the Benibane gang, evident during coordinated efforts like the assault on rival Akehisa High School, where his loyalty remains steadfast despite the physical risks. Tanigawa's development shows incremental resilience. While consistently portrayed as a target for physical comedy and misfortune, his spirited reactions in critical moments reveal underlying tenacity. Instances include holding his own against weaker delinquents in one-on-one fights and displaying uncharacteristic ferocity when defending his allies or confronting injustice, reinforcing his role beyond mere comic relief.