Doukyuusei Reading Order:
1. Doukyuusei (Classmates) (Jul 25, 2006 to Jul 27, 2007) | 1 Volume 6 Chapters - Prologue / Parent Story / Prequel
2. Sotsugyousei (Graduate) (Jan 25, 2008 to Aug 28, 2009) | 2 Volumes 16 Chapters - Sequel
3. Sora to Hara (Dec 26, 2009 to Dec 22, 2011) | 1 Volume 9 Chapters - Spin-off of Doukyuusei & Sotsugyousei (Story of Teacher)
4. Occupation to Beloved (O.B.) (Apr 27, 2012 to Dec 27, 2013) | 2 Volumes 11 Chapters - Side story of Sora To Hara / Sequel to Sotsugyousei
⭐️Graduation Certificate - Epilogue, artbook, sequel to O.B.
5. Dousoukai (Apr 28, 2015) | 1 Chapter - One-Shot
6. Doukyuusei: Gold Ring & Silver Ring (Nov 5, 2016) | 1 Volume 2 Chapters - Side Story of Doukyuusei
7. Blanc (Feb 28, 2018 to Sep 16, 2020) | 2 Volumes 12 Chapters - Last part of three series
8. Futari Gurashi (Living Together) (Dec 28, 2020 to ?) | 1 Volume 5 Chapters - Extras of the protagonists
9. Sajou Rihito no Chichi to Sono Buka (Sep 16, 2022 to ?) | ? Volume ? Chapters - Spin-off of Doukyuusei
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Anime Adaptation:
Doukyuusei (Movie) (Feb 20, 2016) | Movie | 1 episode x 1 hr.
https://myanimelist.net/anime/30346/Doukyuusei_Movie
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Mangaka: Nakamura, Asumiko https://myanimelist.net/people/5583/Asumiko_Nakamura
Serialization: Opera
Official English Translation by Seven Seas (Digital & Print): https://sevenseasentertainment.com/series/classmates-dou-kyu-sei/
Genres: Boys Love, Drama, Romance, Slice of Life, Erotica
Theme: School
Tags: BL, Choir, Classmates, High School, Megane, Music, Opera, Sensei, Series
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Pending:
Doukyuusei: Yoshuu https://myanimelist.net/manga/141517
Douykuusei Gekijou Raijou Senchaku Tokuten Shousasshi https://myanimelist.net/manga/141518
Sotsugyou Album: Doukyuusei & Sotsugyousei Koushiki Fanbook https://myanimelist.net/manga/141519
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For more BL guides, check:
BL with Reading Order Guides: https://myanimelist.net/stacks/34797
