In reply to mplaine: 8B+ and 8C are both covered by the same grade (5-dan) on the Ogawayama scale for bouldering used in Japan. (=5-stage in the useless google-translation of Koyamadas blog).
As far as my very limited Japanese goes, the blog first describes some access issues around the area, then explain that Tokoyo seems to have settled at V14/5-dan and that a new sequence has been found. The last paragraph says that the neighbouring problem "Gense" is 4/5-dan and not v14 or 5-dan in Koyamada's opinion.
(Disclaimer: I often get things wrong and always miss subtext)