Koji (井元工治) Imoto
ID 526833
Born : 1962 Cat. M60 Ultrarunner since 2014 JPN
43
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
66
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
27,9%
Rank quotient ?This runner's calculation uses 43 eligible race(s): Σ(rank − 1) = 5 602; Σ finishers = 20 105. 5 602 / 20 105 × 100 = 27.86%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed45
Km — ultra races5 914 km
> 100 km23
> 160 km10
> 200 km5
Longest race363,0 km
5th Reiheishi Michi Kyoto to Nikko - 363 km — 29/4/2026

Km per year (ultra races)

898
6 races
2022
901
7 races
2023
519
3 races
2024
599
5 races
2025
812
4 races
2026

Race types (share of distance)

Road92,8%
Trail2,3%
Stage4,9%

Wins & podiums (ultra)

🏆 Win0
🏆 Win M0
🏅 Top 30
🏅 Top 3 M1
Longest winning streak0
Current streak0

Records

100 km9h40'2450 mi8h27'52100 mi29h23'24

HISTORY

43 race(s) · 4 stage(s) nested
DateRacePerf.Rk
2026
06.06 100mi JPN3rd Miyakojima Ultra 100 Miles 29:34:16 h47
29.04 363km JPN5th Reiheishi Michi Kyoto to Nikko - 363 km 5d 02:05:21 h4
14–15.03 138km/2stages JPN14th Arakawa Riverside Journey 17:50:08 h19
28.02–01.03 150km/2stages JPN3rd Modern Japanese Silk Road Journey Run 21:47:19 h38
2025
21.12 100km JPN8th Okinawa 100km Ultramarathon 11:37:18 h186
28.09 100km JPN33. Akita Nairiku 100km Marathon 11:53:14 h158
07.06 159km JPN6th Nikko Sennin Concentric Highway Journey Run 30:34:35 h73
31.05 80km JPN5th Lake Suwa Ultra Marathon - 80 km 8:27:52 h5
12.04 160km JPN4th Yagurazawa Round Trip Pre-Tournament 29:52:49 h42
2024
08.06 159km JPN5th Nikko Sennin Concentric Highway Journey Run 29:23:24 h62
06.04 160km JPN3rd Yagurazawa Round Trip Pre-Tournament 31:32:50 h86
09.03 200km JPN14th Little Edo Oedo 200k 35:13:04 h190
2023
10.12 70km JPN10th Izu Trail Journey 11:47:26 h696
03.11 250km JPN4th Tokyo Great Race 250km EA 2d 01:50:35 h18
18.08 101km JPN10th World Cultural Heritage "Fuji" Foot Race 14:37:38 h65
11.06 100km JPN11th Hida Takayama 100 km Ultramarathon 12:30:54 h591
27.05 80km JPN3rd Lake Suwa Ultra Marathon - 80 km 9:18:57 h6
23.04 100km JPN4th Yamadera Zao 100 km Ultra Marathon 12:47:22 h49
11.03 200km JPN13th Little Edo Oedo 200k 33:24:01 h130
2022
04.11 250km JPN3rd Tokyo Great Race 250km 2d 00:42:01 h51
15.10 150km JPN1st Yagurazawa Round Trip Pre-Tournament 28:06:04 h42
12.06 100km JPN16th Iwate Ginga 100km Marathon Challenge 11:31:21 h235
28.05 80km JPN2nd Lake Suwa Ultra Marathon - 80 km 9:15:14 h12
17.04 118km JPN32th Fuji 5 Lakes 118 km Challenge 14:09:43 h225
12.03 200km JPN12th Little Edo Oedo 200k 35:40:12 h182
2021
05.11 252km JPN2nd Tokyo Great Race 250km 46:15:31 h24
23.07 65km JPN12th Nozawa Onsen 4100D Mountain Trail 13:22:32 h372
27.02 200km JPN11th Little Edo Oedo 200k 34:17:18 h133
2020
22.02 206km JPN10th Little Edo Oedo 205k 31:58:10 h89
2019
15.12 100km JPN4th Okinawa 100km Ultramarathon 10:07:48 h57
15.09 100km JPN19th Tango 100 km Ultramarathon 11:09:57 h173
09.06 100km JPN8th Hida Takayama 100 km Ultramarathon 9:59:10 h159
21.04 118km JPN29th Fuji 5 Lakes 118 km Challenge 12:14:59 h64
24.03 100km JPN1st Ibaraki 100k Ultra Marathon 9:50:05 h93
20.01 100km JPN29th Miyako 100 km Ultramarathon 10:36:19 h37
2018
09.09 100km JPN6th 100 km Ultramarathon Hakusan-Shirakawago 12:07:48 h217
22.04 118km JPN28th Fuji 5 Lakes 118 km Challenge 13:04:03 h111
2017
02.07 100km JPN1st Nikko 100km Ultramarathon 9:40:24 h46
11.06 100km JPN6th Hida Takayama 100 km Ultramarathon 10:06:33 h146
23.04 118km JPN27th Fuji 5 Lakes 118 km Challenge 13:54:31 h235
2016
12.06 100km JPN5th Hida Takayama 100 km Ultramarathon 10:36:32 h154
2015
07.06 100km JPN4th Hida Takayama 100 km Ultramarathon 10:35:27 h112
2014
20.04 108km JPN24th Fuji 5 Lakes 108 km Challenge 12:27:19 h211