OVA
Description
Naoki Senda is a delinquent distinguished by his black pompadour and a facial scar. He was a follower of Sugata Kazushi in middle school, alongside Tatsuya Yamazaki, with both aspiring to join The Front of Armament (T.F.O.A.). During this time, they met Hideto Bandou, forming a strong friendship that resulted in the creation of the Bandou Faction.

The trio first enrolled at Kurosaki Industrial High School. After Sugata's death and the rise of a new leader, Kunou Hideomi, whose leadership they despised, Bandou transferred to Suzuran High School to build an army capable of reclaiming power in T.F.O.A. Senda and Yamazaki followed him to Suzuran, where they began their campaign to conquer the school through the Bandou Faction.

As a key member of the faction in his freshman year, Senda participated in its activities to gain control. During his senior year, the faction waged war against the Ebizuka Trio. In a specific move to gain advantage, Senda orchestrated an ambush on Sugihara Makoto in a park restroom, cornering him and Honjou Toshiaki (Pon) with several underlings. Although Pon escaped to call for help, the initial attack succeeded. This victory was short-lived, however, as it provoked retaliation from Harumichi Bouya, who intervened and defeated Senda and his group.

The failed ambush contributed to the Bandou Faction's collapse. After losing their influence at Suzuran, Senda, Bandou, and Yamazaki became targets of The Front of Armament. Senda was the first to suffer retaliation. Members of T.F.O.A., including Mito Yasuyuki and the Kunou brothers, located him and demanded Bandou's whereabouts. Senda refused to cooperate and was defeated in a one-on-one fight by Mito Yasuyuki. As punishment for his silence, Kunou Hideomi ordered Kunou Ryuushin to break both of Senda's arms and legs.

Following the faction's downfall, Senda dropped out of Suzuran and did not graduate. He entered the workforce but struggled professionally, moving from job to job and often becoming submissive to abusive supervisors due to low self-esteem. He worked for a time as a salesman. His former enemy, Honjou Toshiaki (Pon), and Hiromi Kirishima encountered him in this diminished state. Pon, criticizing Senda's defeated attitude, punched him and stated that the Senda he knew would fight back. Some days later, while being scolded by his boss, Senda encountered delinquents who looked down on him. Remembering Pon's words, he fought and defeated them. He then confronted and assaulted his abusive supervisor, along with two others, before leaving town to start anew. Pon later reflected that if he were to meet Senda again and receive a returned punch, he would buy him a beer.

His recorded physical conflicts include a victory against Makoto Sugihara with several underlings, a loss against Harumichi Bouya with several underlings, and a loss in a one-on-one fight against Mito Yasuyuki.