Pre-Series Timeline


 * Sōya Kazama is born.
 * Reiji Kizaki is born.


 * Rinji Amatori is born.
 * Kei Tachikawa is born.


 * Yūichi Jin is born.
 * Jun Arashiyama is born.


 * Isami Tōma is born.


 * Shūji Miwa is born.
 * Yōsuke Yoneya is born.
 * Kirie Konami is born.
 * Shiori Usami is born.
 * Kōhei Izumi is born.
 * Tōru Narasaka is born.
 * Haruka Ayatsuji is born.


 * Kyōsuke Karasuma is born.
 * Shirō Kikuchihara is born.
 * Ryō Utagawa is born.
 * Shōhei Kodera is born.
 * Ken Satori is born.
 * Mitsuru Tokieda is born.


 * Osamu Mikumo is born.
 * Yūma Kuga is born.
 * Ai Kitora is born.


 * Chika Amatori is born.


 * Yūgo Kuga teaches Yūma "The 3 Teachings".


 * Yōtarō Rindō is born.
 * Sōichi Mogami dies and leaves his Trigger behind.
 * Neighbors attack Mikado City, killing many people, and Border agents defend against them.(see Neighbor Attack for more details.)


 * Neighbors get into an internal conflict.
 * Yūgo Kuga dies while saving Yūma.


 * Chika's friend is kidnapped by a Neighbor.


 * Yūma comes to Mikado City from his world.
 * Rad are implanted throught Mikado City and opens irregular gates, so C-Class Border members find and disable them.
 * Yūma fights the Miwa Unit, and wins.(see Yūma Kuga vs. Miwa Unit for more details.)
 * Yūma joins the border.
 * Yūichi and Arashiyama Unit fight Tachikawa Unit and Kazama Unit(see Yūichi Jin and Arashiyama Unit vs. HQ Top Teams for more details.)