He went to Kyoto and hid in the residence of Kimmune SAIONJI who was an old ally, and they plotted to assassinate the Emperor Godaigo and take up arms to reinstate the shogunate with the remnants of the Hojo clan in June 1335, but the plot was exposed before they could act and Kimmune was killed.
その後、京都に上洛して旧知の仲にあった西園寺公宗の屋敷に潜伏し、1335年6月に公宗と共に後醍醐天皇暗殺や北条氏残党による幕府再挙を図って挙兵しようと計画を企んだが、事前に計画が露見して公宗は殺されてしまった。