Daniiel (thanks for posting, see below), Masako and Juergen ran in today's race at Ota-ku. I had my new Brooks racing flats, and yes, ran an age-graded PB of 37:58, not bad considering the Garmin showed the course as 100m long, and I had run a half-marathon the week before! Splits were 3:35 (!) for the first kilometer, and 18:40 for 5k!
Masako finished under 42!
Thanks a lot to Brooks Japan for sponsoring the shoes, they are, honestly, great! Will write about that later! And thanks to the guy who chased me down the home-straight, without him, I would never have gotten under 38!