year 0
- minato and minako are born

year 2
- souji, yosuke, and yu are born

year 9
- yu burns souji
- yu realizes that he's the avatar
- yu leaves a comatose souji
- yu arrives at the air temples
- yu begins airbending training under elizabeth

year 10
- minato and minako's parents are killed
- minato bloodbends and kills two people
- souji resumes firebending

year 19
- yu "completes" his airbending training
- yu arrives at the north pole
- yu begins waterbending training under minato
- souji and yosuke arrive in the north pole two months later
- minako begins firebending training under souji
- yu develops a crush on yosuke
- minato pushes yu into a corner and forces him to firebend
- yosuke gets burned by yu
- yu confesses his background story to minato four weeks since the incident
- minato confesses his background story to yu six weeks since the incident
- souji and minato talk six weeks since the incident
- souji and minato begin developing fwaterbending

year 23
- yosuke returns to republic city with his parents

year 24
- yu completes his waterbending training
- minako, minato, souji, and yu leave for the earth kingdom
- yu begins earthbending training under chie and kanji
- yu begins metalbending training under shinji
- souji and minato begin dating

year 28
- beach party with minato, minako, souji, yosuke, and yu
- yu confesses his feelings to yosuke through a letter
- yosuke develops airbending skills
- yosuke's parents discover yu's letter and forbid yosuke from writing back
- yu does not hear back from yosuke for two weeks
- yosuke leaves on his moped in search of yu
- yu and the gang are called on emergency summons from the air temples
- yu travels to republic city to seek yosuke
- yu encounters yosuke's parents and are told that yosuke left
- yu, chie, and kanji leave for the earth kingdom to search for yosuke
- minato, minako, and souji leave for the air temples to search for yosuke
- yu, chie, and kanji find yosuke in the great divide two months after the confession letter
- yosuke and yu begin dating

year 29
- yu completes his earthbending training
- minako, minato, souji, yosuke, and yu leave for the fire nation
- yu beings firebending training under souji
- souji reveals his scars to yu

year 33
- souji teaches yu how to create lightning
- yu achieves inner peace and forgives himself
- yu completes his firebending training
- yu is a fully realized avatar