Haruchiyo Sanzu/Synopsis

History
Haruchiyo was born as the middle child of the Akashi family, but he later cut ties with his siblings. Starting at a young age, Takeomi, his older brother, would make him responsible for their younger sister's doings and scold him for neglecting Senju's upbringing. Haruchiyo later came to despise this treatment, as well as Senju for frequently victimizing him in her mistakes. When Senju blamed Haruchiyo for destroying Mikey's beloved airplane figure, Haruchiyo was physically attacked by Mikey, which earned him permanent scarring at the corners of his mouth.

Tenjiku Arc
Haruchiyo visits Takemichi Hanagaki's residence with Yasuhiro Muto and the rest of the Fifth Division to restrain him in suspicion of betrayal. He later assists Mucho alone during the confrontation between the First Division members at a private warehouse.

Haruchiyo is also present at the Kanto Incident and flees the bay area after the battle.

Bonten Arc
At a warehouse, Haruchiyo is with Bonten's executives to punish the organization's traitors. Per Manjiro Sano's orders, he kills them one by one.

During Takemichi's search for Bonten's hideout, Haruchiyo appears at the Udagawa Bowling, where Kazutora Hanemiya suspects the members are located. Haruchiyo threatens to shoot Takemichi and insults him. After Mikey's arrival, Haruchiyo leaves as instructed. Some time later, outside of the bowling alley, he sees Mikey on top of the building and yells at him not to jump.

Three Deities Arc
Haruchiyo is introduced as a member of the Kanto Manji Gang led by Mikey. During the Battle of Three Deities, he orders the Kanto Manji Gang members to fight. He partakes in an individual battle with Ran and Rindo Haitani after hitting Kakucho with a pipe.

Kanto Manji Arc
Before the final battle, Haruchiyo and the new executives of the Kanto Manji Gang are present at Mikey's declaration of war against the Second Generation Tokyo Manji Gang. During the battle, he challenges his younger sister Senju Kawaragi to a fight. Senju apologizes for being the cause of Haruchiyo's trauma and scarring when they were younger, but he hits her with a pipe and leaves.

Moments later, Haruchiyo is inside a train, attempting to figure out how to make it move to crash onto freight containers that will inevitably kill everyone in battle. He successfully makes it move out of luck, but he is stopped by Takemichi and Kakucho who have caught onto his plans. He explains that he has visited the yard a couple of times before the battle to plan how he can kill everyone by directing the train off course and running everyone over. Finding this ridiculous, Kakucho tells him that he will kill his allies as well, but Haruchiyo admits that he does not care about anyone other than Mikey. Unleashing a sword, Haruchiyo charges at Takemichi, who is pushed aside by Kakucho. The two of them fight, and Haruchiyo slices Kakucho's chest.

As Kakucho falls to the ground, Haruchiyo hops back in the train and proceeds to operate it again. He remembers the time he swore loyalty to Mikey when he is interrupted by Takemichi, who infiltrates the train and prevents him from nearing the controls. Haruchiyo fights against his hold as he wonders how Takemichi knew about his plan despite never telling anyone about it. A wounded Kakucho attacks Haruchiyo with a wrench, and Takemichi runs to hit the brakes. However, he sees a vision where Haruchiyo impales him with the sword, which Takemichi dodges in time. Surprised by Takemichi's fast reflex, Haruchiyo asks if he is a time leaper as well before getting pushed off the train by Kakucho.

With the train's speed, Haruchiyo looks on in confidence as he guarantees that Kakucho and Takemichi cannot stop the train in time, only to be proven wrong at the last second. Haruchiyo approaches the train and prepares to kill Takemichi with his sword, claiming that he does not stand a chance against Mikey, when Taiju Shiba runs over him with his motorcycle.

As Takemichi meets Mikey face-to-face, Haruchiyo swings his sword at Taiju, who dodges the attack. He then tells Takemichi that Mikey's fate has been sealed for a heinous life ever since he was a child. As Mikey gets consumed by his dark impulses, he knocks Haruchiyo unconscious. Later in the fight, Mikey grabs Haruchiyo's sword and uses it to attack Takemichi. Haruchiyo warns Takemichi that he cannot erase the curse of Mikey's dark impulses and that everyone who tries to save him from it always ends up dying.

After Takemichi and Mikey's final time leap to the past, Haruchiyo is saved from the previous timelines' trauma. Now rid of scars, he becomes Toman's Fifth Division Captain. At present, he attends Takemichi and Hina's wedding, where he is introduced as an online celebrity.