Wow, looks like you might have been one of the last ones! All booked up now.
It’s been a while since I’ve had the bento but I would guess as long as there’s seating I’m sure it shouldn’t be a problem. However, given that its now only being served twice a week and every other day is fully booked out, perhaps you could email and ask? I always enjoy sitting at the counter when I’m there, whether its lunch or dinner.
Alternatively, just arrive early and you could see him put the finishing touches on the final bento. That’s what happened with me when I went but, again, it has been a while and he was doing more of the bento at that time. That time, only one person picked up and everyone else just sat at the counter. If it doesn’t work out, there’s always plenty of space in the Row complex.