The first episode involving Toshinari that comes to mind occurred during the Genpei-gassen (Battle of the Minamoto and Taira clans), also known as the Jisho Juei no ran (Jisho/Juei era War), when Toshinari and TAIRA no Tadanori reunited.
俊成に関するエピソードで第一に思い浮かぶのが源平合戦（治承・寿永の乱）の最中の平忠度との再会であろう。