Yumeji Agakura

Yumeji Agakura is the new mediator of Shibuya.

Appearance
Yumeji is a slim youth with short black hair and pale eyes. He is introduced wearing a short-sleeved dress shirt, a striped tie, and belted business slacks.

Personality
Yumeji has a bracing disposition that he uses to his advantage when holding his own against his adult mediator counterparts. Via alacritous smiles and accommodating statements, he presents himself as a simpatico young man who will be easy to work with—though these he trades for stonier expressions and arguments when striving to prove he will not be as easy to manipulate.

Such careful emotional modulation speaks to an overall genuine maturity on Yumeji's part; however, Yumeji's emotional reaction to seeing his brother's assailant betrays an undeniable callowness underneath it.

Chronology
Yumeji was friends with Polka Shinoyama in their mutual childhood, with the boys having grown apart by the time they are in their mid-teens. Yumeji's life is an increasingly insular one; Yumeji applies himself to his studies and speaks little with anyone other than his teachers and his numerous family members.

During a summer that Yumeji has filled with extra classes, his oldest sister—Majiri Agakura—tells him that he is to replace the recently disappeared Higuro as mediator of the Shibuya district. Although Majiri is vague on many details, she explicitly gives her brother permission to start whatever fight he wishes regarding the subject of Higuro's kidnapping of Lisa Kuraki's man, an affair that saw Momoya Agakura grievously injured.

When the other mediators summon Yumeji to a meeting that will determine his acknowledgement as Shibuya's new mediator, Yumeji's sisters Dahlia and Kana accompany Yumeji as his bodyguards while Momoya patrols the building's perimeter. Several, but not all, of Tokyo's mediators are present when Yumeji arrives at the conference room: Lisa Kuraki, Shinjuku's perimeter; Andalucía, Roppongi's mediator; Gioacchino Soldati, Ikebukuro's mediator; and Katashiro, Akihabara's mediator. All but Katashiro sit around a card table, each (save Katashiro) guarded by their own pairs of bodyguards.

These mediators would have Yumeji explain the Agakuras' presumed involvement in Higuro's disappearance, though, when Yumeji denies personal involvement, they admit that such involvement would not have actually costed him the mediator role. What Lisa does demand accountability for, however, is the Agakuras' kidnapping of Takumi Kuruya at Higuro's instructions. Yumeji warns her that the Agakuras could wage war over Momoya's consequential near-fatal wounds if he so chooses, though he furtively assesses each mediators' bodyguards just in case. It is Lisa's teenaged bodyguard that gives him ominous pause: the girl has Majiri's aura.

Katashiro advises Yumeji to relax, as he does not suspect the Agakuras arranged Higuro's disappearance. Yumeji certainly suspects Katashiro as with the other mediators of having ulterior motives, but he hides his distrust well when he readily acknowledges that the Agakuras 'made the first move' in the kidnapping affair. When Lisa informs him that Misaki Sakimiya—her teenage bodyguard—inflicted Momoya's injuries, Yumeji cannot hide his indignation half as well; he shoves his chair back so that he can rise from his seat.

Kana stops him with a hand on his shoulder and a whisper that Misaki is not only Majiri's newest Agakura sibling candidate, she is—according to Momoya—Phantom Solitaire's pupil. Murmurs ripple through the people present at the latter rumor, ceasing when Lisa alludes to the Agakuras' preoccupation with a certain Shinoyama family guard. Yumeji assures the table that he will not drag that family matter into the matters of the mediators.

The meeting concludes with the mediators' formal acknowledgement of Yumeji as Shibuya's new mediator. What passes for socialization afterwards consists of Andalucía making more barbed comments at Lisa's expense, but she is able to tell Yumeji that she has high hopes for him before the mediators part ways.

Yumeji and his sisters reunite with Momoya outside the building, where Yumeji rereads the bounty advertisement that promises 500 million yen for whoever kills Polka. Eager at the thought of meeting his childhood friend after such a long time, Yumeji tells his siblings that they should meet with Polka before discussing his prospective murder.