Yusaku Fujiki is the protagonist of the anime series 'Yu-Gi-Oh! VRAINS'. He is a highly skilled hacker and duelist living in Den City, where he uses the alias 'Playmaker' in the virtual reality world known as LINK VRAINS. The series follows Yusaku as he battles the Knights of Hanoi to uncover their plans and the mysteries surrounding his past. Initially a lone wolf, Yusaku gradually learns to trust others and form meaningful connections, which plays a crucial role in his journey.