When he served Yoriie MINAMOTO at the age of 19, Yasutoki gave advice to Yoriie, worrying that Yoriie was absorbed in a ball-kicking sport 'Kemari' and did not care for bakufu politics.
源頼家に仕えていた19歳の頃、頼家が蹴鞠に凝って幕政を顧みないことを憂いて諫言したことがある。