| Year | Date | n | Status | Locality | Reference/Source |
| 2014 | August | 1* | Sighting | Off Sakhalin Island, Russia | Weller et al. (2015) [12] |
| 2015 | 20March | 1 | Sighting | Off Kozushima Island, Tokyo 34˚12.137'N - 139˚9.489'E | Kato et al. (2015) [11] |
| 2015 | 24 March | 1 | Sighting | Off Niijima Island, Tokyo 34˚22.231'N - 139˚16.389'E | Kato et al. (2015) [11] |
| 2015 | 31 March | 1 | Sighting | Off Teradomari, Niigata 37˚38'N - 138˚48'E | Kato et al. (2015) [11] |
| 2015 | 19 April | 1 | Sighting | Off Miho, Shizuoka 35˚0'N - 138˚31'E | Kato et al. (2015) [11] |
| 2016 | 12 January | 1 | Sighting | Off Nishikawana, Tateyama, Chiba 34˚57.416'N - 139˚45.103'E | http://nop.chips.jp/frame/003.html (Retrieved at 14 October, 2016) |
| 2016 | 14 January | 1 | Sighting | Off Akasawa, Ito, Shizuoka 34˚51.101'N - 139˚5.771'E | https://oceana.ne.jp/domestic/59265 (Retrieved at 14 October, 2016) |
| 2016 | 9 February | 1 | Sighting | Off Miyakejima Island, Tokyo 34˚3.221'N - 139˚32.449'E | https://www.facebook.com/eiji.yamazaki.7/videos/929475013827287/?fref=nf(Retrieved at 14 October, 2016) |
| 2016 | 4 March | 1 | Stranding | Wadaura beach, Minamiboso, Chiba 35˚2.085'N - 140˚1.05'E | Present study |
| 2016 | 5 April | 1 | Stranding | Arai beach, Ito, Shizuoka 34˚58.057'N - 139˚07.398'E | http://izu-np.co.jp/ito/news/20160406iz0000000018000c.html (Retrieved at 14 October, 2016) |