洞門を完成させたいという了海の真摯な姿に打たれ、手伝うことを決めたから。

Jitsunosuke, the son of Saburobei, had been searching for Ichijuro for many years to avenge his father's death. Finally tracking down the aged Ryosei in Yabakei, Jitsunosuke drew his blade, trembling with rage. However, instead of begging for his life, Ryosei pleaded, 'Please wait just a few more years until this tunnel is completed.' Struck by his sincere attitude, Jitsunosuke temporarily suspended his revenge and, in order to complete the tunnel as quickly as possible, took up a chisel himself and began to help.