Mobile Suit Gundam 00: In Those Days (機動戦士ガンダム00 ｉｎ ｔｈｏｓｅ ｄａｙｓ Kidousenshi Gandamu 00 (Daburuō) in those days?) is a compilation of Yun Kōga's short story mangas serialized in Newtype magazine between November 2008 to August 2010 issues. The stories are set between and after Mobile Suit Gundam 00's First and Second Seasons. The chapters were compiled and published by Kadokawa Shoten on August 26, 2010.
Where Earth and Sky Meet
A story focused on Marina and members of Celestial Being after the Second Season finale.
The Second Birthday
The story focuses on the Innovator's past and Ribbons Almark's motivation. The confrontation between Ribbons and Setsuna continues on the eve of "A wakening of the Trailblazer"; Ribbons' stirring memories within Veda.
The story happened after the First Season's finale. Setsuna wanders around the world and. In his travels, he visited an Irish bar where he met Lyle Dylandy.
At the aftermath of Celestial Being's defeat at the hands of UN Forces, Tiera struggled to comes into terms with what happened as he attempted to bring Celestial Being back together.
Praise the Lord, Allelujah
After the final battle in First Season, Allelujah was captured by the UN. Allelujah pondered about his past.
The Beginning Man
The story centered about Lyle and his thoughts about his brother. The reason about their separation years ago was also explored.
- ISBN 978-4-04-715500-8-C0979
- Gundam 00 in those days in MyAnimeList