Taisei Sonoda, formally written as 園田 大勢 (Sonoda Taisei) with furigana そのだ たいせい, is a male student at Itan Private High School. Born September 8 under the Virgo zodiac sign, he sports slicked-back black hair and wears the standard Itan uniform. A member of a trio with friends Chiarai Shigeo and Shinobino Mono, Sonoda appears in Volume 6 (Chapters 75 and 77), engaging in casual debates about crushes among female classmates like Najimi Osana. These scenes cement his role as a background figure centered on playful peer dynamics. His name cleverly puns on the Japanese phrase その他大勢 (*sonota oozei*), translating to "one of the crowd"—a nod to his minimal narrative prominence. This theme extends to his official character visual, labeled "sonota_visual." A later addition in Chapter 494 (Volume 37 extra page) hints at unspoken feelings for Onigashima Akako, a subtle emotional layer that quietly deepens his persona without shifting his peripheral role. His story remains confined to select manga chapters, with no documented expansions into spin-offs or other media.