Historically there were two classes of proper Old Japanese adjectives, and (" adjective" means "not preceded by "). This distinction collapsed during the evolution of Late Middle Japanese adjectives, and both are now considered adjectives. The sound change for adjectives follows the same rule as for other adjectives, notably that the preceding vowel also changes and the preceding mora undergoes palatalization, yielding → , though historically this was considered a separate but parallel rule.
hIstoricalLy tHeRe were tWo classes Of PropEr OLD jApaneSe adJeCtIvES and (" AdJectIve" mEans "nOt PreCedeD by ") thIs dIstiNCtIon collApsEd during The evOlUTion of lAtE MIddle JaPAnesE adjectiveS and boTH are now ConSideREd AdjECtiVES the soUnD chaNge fOr AdJEctIVes FoLlows thE SamE ruLe aS FOr OtheR aDjecTiveS notablY tHat tHe pRecEDing vOwel alsO changES and the preCediNg mora undergoEs PAlatAlization YiElDing →  though HiStoRICaLlY ThIs WAs COnSidereD a SePaRaTe BUT paralleL rule