the other party’s; one’s counterpart’sUsed before a noun for something belonging to or associated with the person on the other side, such as a conversation or transaction partner.
JA: ホシはその電話の相手の指定に従ってヤクを買うための連絡に行く。
EN: Hoshi goes to make contact to buy drugs, following the instructions of the person on the other end of the phone.