Arata Kaizaki is the main character in the anime and manga series ReLIFE. He is a 27-year-old man who struggles with his career and personal life, feeling lost and unfulfilled. After a chance encounter with a mysterious organization, he is given the opportunity to relive his high school years for a year, allowing him to experience life as a teenager again. Throughout the series, Arata navigates the challenges of adolescence, forming friendships and confronting his past mistakes. His journey highlights themes of growth, self-discovery, and the importance of second chances, making him a relatable character for many viewers.