Just when Horada is about to shoot Masaomi with his gun, a Yellow Scarves member under Anri's control stops him, stating that 'Mother' wouldn't like it if Masaomi were hurt.
The two of them are quickly overwhelmed by Aoba's hyperactive personality and they are persuaded (pressured) into giving Aoba a tour of Ikebukuro since he is new to the area. Mikado then calmly lights Adabashi on fire, causing the stalker to run out of the building they were in and into Tokyo Bay. The next day, Masaomi, Mikado, and Anri go to the park where he buys ice cream for the whole group. He is one of the founders and leader of the Dollars, the former leader of the Blue Squares, and is a member of the Saika Army. Kururi and Mairu point him to another website which contains a news report. That's why...I'm here! The twins are confused as they remember Masaomi being on the day before. Watch all you want.
Because of this, Mikado continued to act as an admin of sorts for the site, occasionally making announcement but rarely giving orders as he believed the Dollars to be a group without restrictions as the original proposal said. The twins say yes and Kida immediately makes the assumption that his account was hacked and also has a good idea as to who is responsible. Before Mikado can ask what is happening, he notices several thuggish looking individuals wearing blue standing behind Aoba. Mikado Ryūgamine thinks his life is quite boring and wants some more excitement, so when he is invited in to the big city by one of his childhood friends he takes the chance. Mikado seemingly comes to his senses and Masaomi forgives him for everything, taking him from the Tokyo Hands building. Aoba states that it was revenge for chasing everyone halfway across the city several months ago. However, he immediately runs into a girl with a scar around her neck, pleading for help.
Saki was kidnapped and tortured by Masaomi left the Yellow Scarves after the war and vowed never to go to "the dark side" again. As she weeps, Mikado and Seiji realize that she must be At Raira Academy the next day, Masaomi tells Mikado that the Internet is buzzing over news of a Dollars meet-up yesterday and the appearance of the Black Rider. Mikado learns that several members of Toramaru were attacked in Saitama and beaten severely to the point where many of the were sent to the hospital. He is the leader of Dollars, and, in the continuing novels, also becomes the temporary leader for the Blue Squares, contracting with Aoba in the sixth novel. As the trio parts ways, Mikado hears the black rider and attempts to get another glimpse of it. The members of the original Yellow Scarves still loyal to Masaomi have been attacked and hospitalized. He also goes on to say that although they attacked Toramaru in the name of the Dollars, Aoba and his group also go by the name Blue Squares. Mikado accepts after a couple of minutes of talking. Celty forcefully attempts to prevent him from leaving the scene, but Mika steps between Seiji and Celty's scythe and cries for her to stop.
Later, he enters Russia sushi with a yellow scarf around his neck and asks Kadota for advice. This information arrived far too late as Celty found a bloody and beaten Shinra on the floor of their apartment.
Kida is alarmed about this and asks if TarouTanaka was on as well. Then Mikado's plan reaches its climax when he confronts Masaomi on the rooftop of Tokyo Hands, near where the original offline Dollars meeting took place. Izaya soon chases the bullies off by crushing one of their phones and properly introduces himself to the three students.
Mikado Ryuugamine (竜ヶ峰帝人, Ryuugamine Mikado) is a major protagonist who moves to Ikebukuro at the start of the series at the invitation of his childhood friend Masaomi Kida. Immediately after, Izumii arrives with his gang, ready to fight the yellow scarves. Through chats with Masaomi, Mikado Ryuugamine decided to come to Ikebukuro, lured in by the sense of excitement and fun that his friend described. Mikado is glad that Shizuo was arrested right after he quit Dollars. In terms of abilities, Masaomi is shown to be a proficient street fighter, being able to easily incapacitate several of Five years before the start of the series, on New Year's Eve, Masaomi witnesses middle schoolers being picked on by a group of high schoolers. Before things get too serious, however, Kyouhei and the gang rides in and pulls Mikado, Anri, and Aoba into the van. Mikado states that regardless of what Aoba planned to do to him, he still put Anri in danger by drawing her into the conflict with the Dollars and Toramaru. Masaomi simply tells him, if that was ever the case, he'd avoid bumping into him at all costs. Masaomi has a very friendly, enthusiastic, charismatic and outgoing personality, and is almost always seen fooling around, smiling, making bad jokes, teasing his friends, and hitting on girls. Most of his questions seem to focus on the Dollars but before they can continue, they discover Anri being bullied. After seeing Anri in the hospital because of the slasher, Masaomi rejoins the Yellow Scarves as their leader. As Mikado thinks of a solution, he gets another disturbing text message on his phone. Izaya taunts Masaomi, asking him why he doesn't just talk to Mikado about it and telling him he is being a coward.