Dai Koyamada has made the first ascent of yet another hard boulder problem, Mona Lisa, ~8B+, at Horai, Japan.
I have completed a project in Area Guernica, Horai, Aichi pref. It is a huge and interesting overhanging wall with a lot of tiny pinch holds. It felt like 8B+ to me. A wonderful line.
I don't know how many 8B+-or-harder Dai has put up, but I would be very surprised if anyone has done more. According to HardClimbs he has done 31 ~8C's, 25 of which were first ascents. Sure, some of them have been downgraded, but on the other hand many of them have yet to see a second ascent.