Shigeo Chiarai attends Itan Private High School, starting in Class 1-1 before advancing to Class 2-3 and finally Class 3-3. He sports short, fluffy dull-orange hair, typically secured by three hairpins on the right side and a small braided tail at the back, usually seen in the standard school uniform. He radiates spontaneous cheerfulness and friendliness. Yet in matters of romance, he displays bold frivolity, frequently joining peers Sonoda Taisei and Shinobino Mono in fantasizing about female classmates. These tendencies surface during group discussions evaluating potential romantic partners within their class. This shared inclination for exaggerated romantic daydreams leads the trio to establish the Delusion Club. Chiarai maintains steady friendships throughout the series, primarily with Sonoda and Shinobino. Their group dynamic revolves around comedic escapades centered on attraction and social scenarios, cementing his role as a supportive, if sometimes misguided, friend. He is also identified as the third member of the Makeru Yadano fan club, signaling his admiration for the competitive classmate. His background includes a July 8th birthday, placing him under the Cancer zodiac sign. Academically, he progresses alongside the main cast, but his established traits and friendships show little significant evolution. His surname, a linguistic pun on "charai" meaning "frivolous" or "flashy," reflects his lighthearted and occasionally superficial social approach. Within school life, Chiarai remains a secondary figure, lacking major individual storylines or transformative developments. His presence primarily provides comic relief, especially through the Delusion Club's antics in group settings.