Timeline

An in-universe timeline is created whenever Takemichi Hanagaki travels to the present to see the changes he has caused through his time leaps. The first recorded timeline was the original universe in the beginning of the story, where Takemichi first learned about the Tokyo Manji Gang dispute that took the lives of Hinata and Naoto Tachibana.

Events with date approximations are denoted by "c." (circa) based on the currently available information provided by the anime and manga series. Therefore, they shall not be considered official dates for they are subject to change once new information is given. For the sake of clarity, this approximation system will be observed throughout the timeline of events.

History
Timeline Continuity= {| class="wikitable" width="100%" style="border:2px solid #ab0f0f;" ! style="width: 15%; background:#fec356;" | ! style="width: 85%; background:#fec356;" |
 * - style="color:#000;"
 * 2004
 * April — Chifuyu meets Baji, who goes to the same school as him. Later on, he is cornered by the local biker gang Mandala, but gets rescued by Baji. They become friends.
 * April — Chifuyu meets Baji, who goes to the same school as him. Later on, he is cornered by the local biker gang Mandala, but gets rescued by Baji. They become friends.

c. 2004 — Inupi gets released from reform school and finds out that the Ninth Generation Black Dragon has been defeated by Toman. Koko takes him to Taiju to help him revive the gang. Inupi is defeated by Taiju, and the three of them establish the 10th Generation.
 * 2005
 * January 1 — Toman celebrates the new year by visiting the beach.
 * January 1 — Toman celebrates the new year by visiting the beach.

{| class="wikitable" width="100%" style="border:2px solid #ab0f0f;" ! style="width: 15%; background:#fec356;" | ! style="width: 85%; background:#fec356;" |
 * -|Letter from Baji Continuity=
 * - style="color:#000;"
 * 2004
 * April — Chifuyu meets Baji, who goes to the same school as him. Later on, he is cornered by the local biker gang Mandala, but gets rescued by Baji. They become friends.
 * April — Chifuyu meets Baji, who goes to the same school as him. Later on, he is cornered by the local biker gang Mandala, but gets rescued by Baji. They become friends.

Sometime later — Chifuyu decides to join Toman, going against Baji's ideas of keeping him safe, and after a conflict between the two, Baji decides to have him join his division as one of the members.

During a Friday in April — After Baji's complaints about Yagyo Doji's constant threats, Chifuyu decides to go it alone to prove his worth and rise in his position. Upon arriving at the abandoned hospital that served as a base for the gang, Chifuyu meets Ryusei Satou, who introduces himself as the leader of the gang.

Challenging for a fight, Ryusei tests Chifuyu, seeing his potential by hitting him, Chifuyu is surprised by the arrival of other Toman members, realizing that it was all a hoax, Ryusei reveals himself as the vice-captain of Tokyo Manji's first division.

A few days after the fight  — Chifuyu returned to school now discovering that Ryusei was also attending the same school as him and Baji, soon the two were surprised by the arrival of a gang to invade the school. Having promised his mother not to get involved in a fight, Baji finds himself lost in the middle of the conflict, leaving Chifuyu and Ryusei to solve it.

While the fight was going on, Baji has his arm broken by a blow from one of the gang members, causing them to go on alert. During this, the gang leader reveals that they have been sent at the request of Yotsuya Kaidan, who decides to put an end to the Toman members. Acting out of anger, Ryusei almost kills the gang leader by throwing him off the terrace, Chifuyu intervenes, preventing the leader's death.

Days after the invasion — Chifuyu, during an investigation, discovers that Ryusei was once part of Yotsuya Kaida, believing that the invasion had more meaning, he runs to the Yotsuya territory looking for Ryusei. Before he can continue, Chifuyu is knocked out by the vice-captain of Yotsuya Kaidan, who decides to kidnap them.

Trivia

 * Emma's birthday was confirmed to fall on November 25, 1991, per the Official Character Book. However, Takemichi traveled to the present a week earlier, on November 18, during his 12th time leap, which goes beyond the theory that his time leaping ability can only take him exactly twelve years back and forth through time.