They belong to the Shoretsu School, which divides their dependent sutra, twenty-eight chapters of Hokke-kyo Sutra (Lotus Sutra), into two and call the first half 'Shakumon' and the second half 'Honmon,' and regard the master secrets of the Hokke-kyo Sutra to be included in Honmon.
勝劣派、すなわち所依の経典法華経二十八品を前半の「迹門」、後半の「本門」に二分、本門に法華経の極意があるとする一派に属する。