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Ogawa lists GOSAN no Heart as a spin-off of this work. However, if you want to get right into the Gosan Series & stories about the Udou Brothers you can skip this and start with Gosan no Heart without missing information and getting confused!
Chapters 1&2 with Maki&Fukamachi should be continued in Gosan no Heart's extra, HOWEVER it's not listed with the uploads of it on Mangago. INSTEAD it's chapter 7.5 under this title!
The beginning of the interwoven stories of the Udou Brothers.
Chapters 1-3 "The Heart of Miscalculation" with Miki&Udou, followed by 2 unrelated one-shots, then extras with Miki&Udou.
A spin-off of Gosan no Heart, this is the story of Udou Ryuuta's older brother, Udou Takayuki.
Short story about both Udou brothers and their very different love lives.
Sequel to Gosan de Fukou na Gojitsudan with both Udou Brothers.
SEQUEL TO Gosan de Fukou na Koibanashi with Udou Takayuki & Seiji Kiyotake.
Sekai wa Kimi de Mawatteru