Ichiban Kasuga is the main protagonist of the video game series Yakuza, specifically featured in Yakuza: Like a Dragon. He is a former member of the Tojo Clan, a fictional yakuza organization in Japan. Ichiban is known for his optimistic personality and strong sense of justice, which often leads him to help those in need. In the game, Ichiban is wrongfully imprisoned for 18 years, and upon his release, he discovers that the world has changed significantly. He embarks on a journey to uncover the truth behind his betrayal and to find his place in a new society, all while forming bonds with various characters along the way.