Alti is one the 100 different Monster Fighters. It was used by Yugi Mutou in the manga.
Yugi used Alti to defeat Jonouchi twice. Yugi was later challenged to a game by Koji Nagumo. However, Koji cheated by punching Yugi and stole his equipment afterwards.
Koji attempted to sell Alti, along with other Monster Fighters he had stolen. However Yugi returns as Dark Yugi and defeats Koji in a Shadow Game of Monster Fighter, winning Alti back.