This is a chronological timeline of all important events from the Sekai Series.
Year X = the year in which Our Broken World takes place.
18 Years Before Year X[]
- Samatoki Hitsuuchi is born.
- Kuroneko Byouinzaka is born.
- Hakohiko Mukaezuki is born.
- Ririsu Kotohara is born.
17 Years Before Year X[]
- Yorutsuki Hitsuuchi is born.
- Rokunin Kazusawa is born.
15 Years Before Year X[]
- Kogushi Kushinaka is born.
- Kurori Douno is born.
- Rouya Gakemura is born.
14 Years Before Year X[]
- Meiro Byouinzaka is born.
13 Years Before Year X[]
- Choushi Kushinaka is born.
12 Years Before Year X[]
- Fuyako Togishima is born.
10 Years Before Year X[]
- The Kazusaen Private Academy building is moved from Europe to Japan, first being used as a middle school.