This is the sequence of the story

sorry... the extra one is this manga
http://www.mangago.zone/read-manga/haikyu_dj_kurotsuki_sairoku_hon/

Can someone give me the link for the third one? 3. Tsukishima-kun wa Benkyouchuu.

1) How are you feeling, Glasses-kun?
https://myreadingmanga.info/cinnamon-macho-haikyuu-dj-gokigen-ikaga-megane-kun-eng/
2) Let's get married
https://myreadingmanga.info/075-hq-scans-cinnamon-macho-kekkon-shiyo-yo/
3) Tsukky is studying in his room now
https://myreadingmanga.info/tsukishima-kun-wa-benkyouchuu/
4) Date
https://myreadingmanga.info/cinnamon-macho-haikyuu-dj-date-eng/
5) Kuroo-san is acting strange
https://myreadingmanga.info/cinnamon-macho-kuroo-san-ga-hennandesu/
6) Extra (This manga)
http://www.mangago.zone/read-manga/haikyu_dj_kurotsuki_sairoku_hon/

Omg thank you so much !! (ノ≧∇≦)ノ

Thanks for the links!

Is the third one not uploaded in mangago?