Best ranking in the league
* current league of the club is played 73. season.
| League | Team | Season | W | D | L | Score | PTS | Team strength | Position |
| | Iwakuni | 15 | 36 | 2 | 0 | 178:29 | 110 | ![]() | 1. |
| | Iwakuni | 16 | 36 | 2 | 0 | 200:28 | 110 | ![]() | 1. |
| | Iwakuni | 17 | 36 | 1 | 1 | 208:29 | 109 | ![]() | 1. |
| | Iwakuni | 25 | 26 | 6 | 6 | 87:27 | 84 | ![]() | 1. |
| | Iwakuni | 39 | 33 | 2 | 3 | 151:31 | 101 | ![]() | 1. |
| | Iwakuni | 46 | 29 | 8 | 1 | 79:27 | 95 | ![]() | 1. |
| | Iwakuni | 59 | 23 | 6 | 9 | 61:31 | 75 | ![]() | 1. |
| | Iwakuni | 62 | 23 | 5 | 10 | 61:35 | 74 | ![]() | 1. |
| | Iwakuni | 70 | 27 | 5 | 6 | 84:40 | 86 | ![]() | 2. |
| | Iwakuni | 28 | 22 | 4 | 12 | 77:48 | 70 | ![]() | 2. |
Wins in a row
| Unbeaten streak
|
Wins away
| Wins home
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