- 1970 Team founded by former Kyoto University players and staff.
- 1988 New sponsorship with the Iwatani International Corporation. Team renamed the Iwatani Sidewinders.
- 1990 Join the X-League
- 1998 Finished 4th in the West division (1 win, 4 losses)
- 2003 Finished 6th in the West division (0 wins, 5 losses). Lost X2-X1 replacement match against the Finies Football Club. Demoted to X2 for the following season.
- 2004 Finished 1st in X2 West division (5 wins, 0 losses). Won X2-X1 promotion match against the Hankyu Bruins 24-15. Promoted to X1 for the following season.
- 2006 Finished 6th in the West division (1 win, 4 losses). Lost X1-X2 replacement match against the Nagoya Cyclones) 0-7. Demoted to X2 for the following season.
- 2007 Iwatani International Corporation ends team sponsorship. Team renamed the Sidewinders.
- 2009 Finished 5th in the X2 West division (1 win, 4 losses). Lost X2-X3 against N.A.C.L. Demoted to X3 for the following season.
- 2010 Finished 1st in the X3 West division. Won X3-X2 promotion match against N.A.C.L. Promoted to X2 for the following season.
- 2015 Finished 1st in the X2 West division (5 wins, 0 losses). Won X2-X1 promotion match against the Fuji Xerox J-Stars 17-10. Promoted to X1 for the following season.
| X-League Champions (1987–present)
|
Division Champions
|
Final Stage/Semifinals Berth
|
Wild Card /First Stage Berth
|
| Season
|
League
|
Division
|
Regular Season
|
Post Season Results
|
Awards
|
Head coaches
|
| Finish
|
Wins
|
Losses
|
Ties
|
| 1997
|
X1
|
West
|
5th
|
1
|
4
|
0
|
|
|
Yorimitsu Morishita
|
| 1998
|
X1
|
West
|
4th
|
1
|
4
|
0
|
|
|
Yorimitsu Morishita
|
| 1999
|
X1
|
West
|
6th
|
0
|
5
|
0
|
|
|
Yorimitsu Morishita
|
| 2000
|
X1
|
West
|
6th
|
0
|
5
|
0
|
|
|
Yorimitsu Morishita
|
| 2001
|
X1
|
West
|
4th
|
2
|
4
|
0
|
|
|
Yorimitsu Morishita
|
| 2002
|
X1
|
West
|
4th
|
2
|
3
|
0
|
|
|
Yorimitsu Morishita
|
| 2003
|
X1
|
West
|
6th
|
0
|
6
|
0
|
Lost X1-X2 replacement match (Finies Football Club)
|
|
Yorimitsu Morishita
|
| 2004
|
X2
|
West
|
1st
|
6
|
0
|
0
|
Won X2-X1 promotion match (Hankyu)
|
|
Yorimitsu Morishita
|
| 2005
|
X1
|
West
|
5th
|
1
|
5
|
0
|
|
|
Yorimitsu Morishita
|
| 2006
|
X1
|
West
|
6th
|
1
|
4
|
0
|
Lost X1-X2 replacement match (Nagoya) 0-7
|
|
Yorimitsu Morishita
|
| 2007
|
X2
|
West
|
3rd
|
2
|
4
|
0
|
|
|
Yorimitsu Morishita
|
| 2008
|
X2
|
West
|
5th
|
1
|
5
|
0
|
Won X2-X3 replacement match (NACL)
|
|
Yorimitsu Morishita
|
| 2009
|
X2
|
West
|
5th
|
4
|
5
|
0
|
Lost X2-X3 replacement match (NACL)
|
|
Yorimitsu Morishita
|
| 2010
|
X3
|
West
|
1st
|
7
|
1
|
0
|
Won X3-X2 promotion match (NACL) 14-3
|
|
Yorimitsu Morishita
|
| 2011
|
X2
|
West
|
2nd
|
7
|
2
|
0
|
|
|
Yorimitsu Morishita
|
| 2012
|
X2
|
West
|
3rd
|
3
|
4
|
0
|
|
|
Yorimitsu Morishita
|
| 2013
|
X2
|
West
|
4th
|
6
|
2
|
1
|
|
|
Yorimitsu Morishita
|
| 2014
|
X2
|
West
|
2nd
|
6
|
2
|
0
|
|
|
Yorimitsu Morishita
|
| 2015
|
X2
|
West
|
1st
|
6
|
1
|
1
|
Won X2-X1 promotion match (Fuji Xerox) 17-10
|
|
Yorimitsu Morishita
|
| 2016
|
X1
|
West
|
6th
|
2
|
6
|
0
|
Lost X1-X2 replacement match (Club Hawkeye) 17-19
|
|
Yorimitsu Morishita
|
| 2017
|
X2
|
West
|
2nd
|
4
|
3
|
0
|
Won X2-X1 promotion match (Club Hawkeye) 17-3
|
|
Yorimitsu Morishita
|
| 2018
|
X1
|
West
|
6th
|
2
|
6
|
0
|
Lost X1-X2 replacement match (Opatsu Fukuoka) 7-22
|
|
Hatahara
|
| Total
|
63
|
82
|
2
|
(1997–2018, includes only regular season)
|
| 5
|
5
|
0
|
(1997–2018, includes only playoffs)
|
| 68
|
87
|
2
|
(1997–2018, includes both regular season and playoffs)
|
