Osomatsu-san Universe Timeline
This timeline considers canon accuracy priority in the following order; S3 > Movie > S2 > S1 > Kun.
Selection Screen
1990
25th August
The sextuplets are conceived.
1991
24th May
The sextuplets are born
1992
????
Matsuyo and Matsuzou get married
This skit occurs during S2 P1. Following the priority order of Movie > S1, this means the Matsuno's married while the sextuplets were 1. If S1 > Movie were to be followed, however, the sextuplets would be -3. If they meant the marriage happened at -3, this would occur in 1989.
24th May
The sextuplets turn 1.
2006
April
The sextuplets enter Akatsuka High.
The sextuplets are all put in the same class.
24th May
The sextuplets turn 15.
2007
April
April
The sextuplets enter their second year of high school.
The sextuplets are put into seperate classes. One class has Choro, Jyushi, and Todo (Takahashi is also in this class). And the other has Oso, Kara, and Ichi.
At this point the sextuplets are still getting along, aided by the forced distance between them. These two classes share a swimming class, as well.
Karamatsu is in the drama club this year, and plays a tree. Karamatsu was still confident this year, but that plummets next year.
24th May
The sextuplets turn 16.
2008
~Jan-Feb
The sextuplets classmates in Akatsuka High begin to find their cohesion unnerving. The sextuplets slowly begin to shift away from one another.
The sextuplets are all put in the same class.
April
The sextuplets enter their third year of high school.
The sextuplets are put into seperate classes. One class has Oso and Ichi (Takahashi is also in this class). One class has Kara and Jyushi. And the other has Choro and Todo.
At this point the sextuplets are refusing to talk to each other at all. Kara and Todo are the only ones willing to reach out to the others. Choro and Todo have the closest bond of all the sextuplets at this point.
Karamatsu takes a severe plummet in confidence, and keeps to himself a lot.
Totoko refers to the sextuplets in a very distant way, and doesn't seem very connected to them at all at this period of time.(This reinforces my personal opinion that the Totoko worship is more of a group-bonding experience, as opposed to a strong opinion any one individual Matsuno actually feels.)
24th May
The sextuplets turn 17.
2009
~March
The Sextuplets prepare to graduate.
The events of the Movie take place.
24th May
The sextuplets turn 18.
Age pinch point for calculating all other ages. Based off (1) & (2).]
2015
Season 1 - First Half
...
24th May
The sextuplets turn 24.
S1 states the boys are 10 years older then they are in Osomatsu-kun. This would place them at roughly 20 years old at this exact time. However, more recent media is being prioritised in accuracy; hence the decision to mark their age as 24 years old.
2016
Season 1 - Second Half
...
24th May
The sextuplets turn 25.
2017
Season 2 - First Half
..
24th May
The sextuplets turn 26.
2018
Season 2 - Second Half
..
24th May
The sextuplets turn 27.
2019
~March
- The graduating class of Akatsuka High which contained the Osomatsu-san siblings has it's ten year reunion.
- That night, the sextuplets travel back in time.
24th May
The sextuplets turn 28.
Age pinch point for calculating all other ages.
2020
Season 3 - First Half
...
24th May
The sextuplets turn 29.
2021
Season 3 - Second Half
...
24th May
The sextuplets turn 30.