Head to Head
| USN | 2021/09/13 08:04 | Japan v Ireland | W | 0-5 |
| International | 2021/07/03 12:00 | Ireland v Japan | W | 39-31 |
| World Cup | 2019/09/28 07:15 | Japan v Ireland | L | 19-12 |
| International | 2017/06/24 05:40 | Japan v Ireland | W | 13-35 |
| International | 2017/06/17 05:00 | Japan v Ireland | W | 22-50 |
Home History
| USN | 2021/09/13 08:04 | Japan v Ireland | W | 0-5 |
| International | 2021/07/10 18:15 | Ireland v USA | W | 71-10 |
| International | 2021/07/03 12:00 | Ireland v Japan | W | 39-31 |
| Six Nations | 2021/03/20 16:45 | Ireland v England | W | 32-18 |
| Six Nations | 2021/03/14 15:00 | Scotland v Ireland | W | 24-27 |
| Six Nations | 2021/02/27 14:15 | Italy v Ireland | W | 10-48 |
| Six Nations | 2021/02/14 15:00 | Ireland v France | L | 13-15 |
| Six Nations | 2021/02/07 15:00 | Wales v Ireland | L | 21-16 |
Away History
| International | 2021/10/23 04:45 | Japan v Australia | L | 23-32 |
| USN | 2021/09/13 08:04 | Japan v Ireland | L | 0-5 |
| International | 2021/07/03 12:00 | Ireland v Japan | L | 39-31 |
| International | 2021/06/26 14:00 | British & Irish Lions v Japan | L | 28-10 |
| Six Nations | 2020/01/28 13:41 | England v Japan | D | 0-0 |
| World Cup | 2019/10/20 10:15 | Japan v South Africa | L | 3-26 |
| World Cup | 2019/10/13 10:45 | Japan v Scotland | W | 28-21 |
| World Cup | 2019/10/05 10:30 | Japan v Samoa | W | 38-19 |