This junior butler was the third person who played VRC and formed a party with them.
At that time, he was delivering food to their Headmaster when he found out that the pair of master and butler were immersed in playing the game. He notified them, wanting to report that he had already delivered the food to the head butler, but he was dragged by the two people instead to form a party and clear the dungeons.
Since the pair of master and butler was just novices without online friends, they would sometimes encounter some difficulties when clearing specific dungeons with only the two of them, so they dragged this junior butler to add to the numbers. From that moment on, the junior butler inevitably became a party member with the head butler and their Headmaster and joined whenever the two needed more people.
Sometimes, he would also act as a lookout or a messenger for urgent matters.