Hikaru Kusakabe is a high school student and one of the main protagonists in the anime and manga series Doukyusei. Known for his laid-back and carefree personality, Hikaru is a member of a rock band and often seen with his guitar. Despite his seemingly carefree attitude, Hikaru is deeply emotional and sensitive, particularly when it comes to his relationship with his classmate, Rihito Sajou. The series explores their evolving romantic relationship, highlighting themes of self-discovery and the challenges of young love.