He has stated in an interview that he was a member of his high school's track and field team and that he loves to watch baseball both emphasized in his hit manga Suzuka.
He debuted in 1996 with the one-shot HALF & HALF in Magazine Fresh. His two hits, Suzuka and Cross Over, both mixed the genres of sports with high school romance. Suzuka focused on track and field while Cross Over used basketball.
In 2009 he designed the High School Girl Kimchi for Hokubi Construction food company.
- HALF & HALF (1996 Magazine Fresh; Kodansha)
- W's (W's～ダブルス～ Daburusu?) (2000–01 Kodansha)
- Cross Over (2002–03 Weekly Shōnen Magazine; Kodansha)
- Suzuka (涼風?) (2004–07 Weekly Shōnen Magazine; Kodansha); English translation: Suzuka (2006–2010 Del Rey Manga)
- Love Letter: Seo Kōji Tanpenshū (ラブレター ～瀬尾公治短編集～?, Love Letter: Kōji Seo's Collection of Short Stories) (2007 Kodansha)
- Kimi no Iru Machi (君のいる町?, A Town Where You Live) (2008–2014 Weekly Shōnen Magazine; Kodansha)
- Princess Lucia (2009–ongoing Monthly Comic Blade; Mag Garden)
- LovePlus Rinko Days (ラブプラス Rinko Days?) (2010–11 Bessatsu Shōnen Magazine; Kodansha)
- Half & half (2012–ongoing Bessatsu Shōnen Magazine; Kodansha)
- Fuuka (風夏?, Fuuka) (2014–ongoing Weekly Shōnen Magazine; Kodansha)
- Seo, Kouji. "瀬尾ダンデイ事務所" (in Japanese). Retrieved 12 November 2008.
- "Aria's Amano to Launch Amanchu! Manga on November 29". Anime News Network. 30 October 2008. Retrieved 12 November 2008.
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