Tsuji is a working partner of Andō.
Andō and Tsuji drive a truck in Southern Alps and almost run over Gin who has just escaped Hōgen's fort. The men believe they caused the dog's wounds. Andō thinks they should take him to see his uncle who owns an animal clinic while Tsuji is much less eager to help the wounded animal though he eventually agrees.
Tsuji and Andō take Gin inside and start to drive away but they get surrounded by Murder S and his minions. The men manage to drive away after all, with Murder S on the roof. Tsuji isn't seen again but it's later shown that he and Andō succeeded in taking Gin to see the doctor.