During the early sixteenth century (the mid-Sengoku (Warring States) period), Mitsumura's grandson Shigetane OIKAWA fought with the Esashi clan but was defeated, and consequently the Mitsumura family line went to ruin.
十六世紀初頭（戦国時代中頃）、光村の孫・及川重胤は江刺氏と戦って敗れ、光村の家系は衰退した。