However, the plot was revealed due to betrayal, resulting in the deportation of Shunkan to the Kikaiga-shima Island (Satsuma Province) along with FUJIWARA no Naritsune and TAIRA no Yasuyori (the Shishigatani plot).
だが、密告により陰謀は露見し、俊寛は藤原成経・平康頼と共に鬼界ヶ島（薩摩国）へ配流された（鹿ケ谷の陰謀）。