It was also a branch of the Nijo school that was passed on by Sanenari SHIMIZUDANI, a court noble from Tosho-ke (the hereditary lineage of Court nobles occupying relatively high ranks) to the Kagawa family of lower-class nobles.
堂上家の公家だった清水谷実業から地下の香川家に伝えられた二条派の分流でもある。