Tatsuya Bitou was the Boss of Housen Academy during Harumichi Bouya's sophomore year at Suzuran, he is one of The Four Kings in his generation and the middle Bitou brother. He looked up to his elder Brother Makio Bitou who was recognized as Housen's strongest fighter in its history and has held a grudge against Suzuran ever since one of their students stabbed Makio to death during a War with Housen in the past.
Tatsuya and Kunou Ryuushin have a rivalry because of an undisclosed incident between the two of them in the past in which Tatsuya totally defeated Ryuushin. Before deciding to go underground, He passed on his position to his younger brother Hideyuki Bitou, just before joining Bouya and Ryuushin to battle the Snake Heads. After this incident, his brother was later challenged and defeated by King Joe. Upon meeting with Joe, Tatsuya acknowledged that if he beat Hideyuki, he deserved to rule Housen. He and his Brother move to finish High School in Machida, Tokyo after the loss, it is here that Tatsuya would meet and be severely defeated by the Manji Empire's Kuzugami Tatsuo.
After recovering from his injuries Tatsuya decides to become a Boxer and unknowingly joins the same Gym as his long-time rival Kunou Ryushin, although it is clear because of their past history of going from fighting against each other to teaming up, along with Bouya that they have a new found respect for one another.
As a Freshman he followed Narumi Taiga, Housen's then leader on his crusade to avenge Makio's death which eventually lead to a clash with the GPS, one of Suzuran's ruling factions at the time. After Narumi's defeat by Genji Takiya, Tatsuya resolved to find his own way to payback Suzuran for his Brother's death. Eventually assuming leadership of Housen for a short time, along with his youngest brother he again attempted to challenge Suzuran but he too was defeated by Harumichi Bouya the top dog of Suzuran during his sophomore Year.
During his senior year, Tatsuya decided to go underground, handing over his position of leadership over Housen to his younger brother Hideyuki Bitou. He later joined Harumichi Bouya and Kunou Ryuushin when they, along with Haruyama Koichi formed P.A.D with the sole purpose of going to war with the Snake Heads.