Shinichi (笠井慎一) Kasai
ID 708356
Born : 1967 Cat. M55 Ultrarunner since 2015 JPN
28
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
49
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?JPNJapan
7,0%
Rank quotient ?This runner's calculation uses 28 eligible race(s): Σ(rank − 1) = 1 597; Σ finishers = 22 930. 1 597 / 22 930 × 100 = 6.96%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed28
Km — ultra races2 578 km
Longest race100,0 km
36th Fuji 4 Lakes 100 km Challenge — 19/4/2026

Km per year (ultra races)

361
4 races
2022
272
3 races
2023
49
1 race
2024
400
4 races
2025
100
1 race
2026

Race types (share of distance)

Road92,4%
Trail7,6%

Wins & podiums (ultra)

🏆 Win0
🏆 Win M0
🏅 Top 33
🏅 Top 3 M3
Longest winning streak0
Current streak0

Records

100 km8h33'36

HISTORY

28 race(s)
DateRacePerf.Rk
2026
19.04 100km JPN36th Fuji 4 Lakes 100 km Challenge 9:28:42 h57
2025
21.12 100km JPN8th Okinawa 100km Ultramarathon 10:07:36 h71
28.09 100km JPN28th Muraoka 100 km Ultra Marathon 9:57:09 h18
18.05 100km JPN31th Yatsugatake Nobeyama 100 km 10:15:05 h68
20.04 100km JPN35th Fuji 4 Lakes 100 km Challenge 9:35:00 h86
2024
13.10 4h JPN3rd Akutaga 4-hour endurance in Fujieda 48.600 km3 🥉
2023
11.11 100km JPN10th Michikusa-Ultra, Minamiizu 100 km 10:00:48 h6
24.09 4h JPN2nd Akutaga 4-hour endurance in Fujieda 72.000 km3 🥉
15.01 100km JPN3rd Tokyo Edogawa Ultra Marathon - 100 km 8:42:02 h5
2022
18.09 100km JPN20th Tango 100 km Ultramarathon 10:09:03 h39
11.09 4h JPN1st Akutaga 4-hour endurance in Fujieda 61.200 km9
22.05 100km JPN28th Yatsugatake Nobeyama 100 km 10:00:54 h55
24.04 100km JPN4th Osaka Yodogawa 100 km Ultra Marathon 8:52:10 h3 🥉
2019
19.05 100km JPN25th Yatsugatake Nobeyama 100 km 9:52:53 h65
28.04 100km JPN21. Okukumano 100 km Ultramarathon 8:33:36 h6
20.01 100km JPN29th Miyako 100 km Ultramarathon 9:53:00 h21
2018
09.09 100km JPN6th 100 km Ultramarathon Hakusan-Shirakawago 9:36:51 h27
30.06 45km JPN8th Utsukushigahara 45 km Trail Run 5:38:09 h25
22.04 100km JPN28th Fuji 5 Lakes 100 km Challenge 10:26:25 h171
2017
17.12 100km JPN2nd Okinawa 100km Ultramarathon 10:03:00 h29
10.09 51.4km JPN7th Hakuba Int. Trail Run 5:57:58 h40
25.06 100km JPN32. Lake Saroma 100 km Ultramarathon 10:01:15 h404
21.05 100km JPN23rd Yatsugatake Nobeyama 100 km 10:19:35 h62
23.04 100km JPN27th Fuji 5 Lakes 100 km Challenge 9:17:25 h47
2016
16.10 100km JPN22nd River Shimanto 100km 9:35:01 h99
12.06 100km JPN5th Hida Takayama 100 km Ultramarathon 9:37:19 h58
24.04 100km JPN26th Fuji 5 Lakes 100 km Challenge 9:33:31 h70
2015
06.06 100km JPN3rd Tokyo Shibamata 100 km 9:30:49 h78