Akutaro Shindo leads the delinquent NG Boys gang, imposing crushing weekly financial quotas on his members. This heavy burden forces the NG Boys to aggressively invade rival gang territories to gather the demanded funds. His actions are fueled by a deep-seated resentment stemming from his past. Once saved and admired by Kenichiro Doman during their youth, Akutaro later felt dismissed and rejected by him. This perceived betrayal ignited an intense desire for revenge, driving Akutaro to target and dismantle everything Kenichiro values. To further his vendetta, Akutaro allies with the supernatural entity Ichiya, who merges with hosts. Ichiya exploits Akutaro's potent anger, fear, and ruthlessness to strengthen their bond and enhance their combined combat power. However, Ichiya eventually abandons Akutaro, deeming him insufficiently powerful, and shifts focus to Matakara Asamine as a superior host. This abandonment leaves Akutaro vulnerable and diminishes his standing. Exploiting Matakara's emotional vulnerability after distressing news about his hospitalized brother and feelings of betrayal by Arajin, Akutaro deliberately reveals the existence of Senya—the genie bound to Arajin Tomoshibi. This manipulation aims to destabilize relationships and advance Akutaro's revenge against Kenichiro. Following a combat defeat by Arajin Tomoshibi, who temporarily merged with Senya for amplified strength, Akutaro suffers public humiliation. This loss erodes his authority, leading NG Boys members and other delinquents to mock him with the derogatory nickname "Ara-pyon." His subsequent actions and whereabouts remain unspecified.