We love all of humanity. Mysterious chat room messages, all posted under the name "Saika," profess love for humanity - and for one man in particular. Saika's target: Shizuo Heiwajima!! Over fifty people have been struck in the worst case of serial slashings in the history of Ikebukuro. But the slasher's victims have tasted not only the blade, but also the vision of their attacker. A vision of love, love, love that can only be realized when their own blades have pierced the bodies of their beloveds. Shizuo braces himself for a battle to the death in the shocking climax of the Saika Arc!!

"That's why I'm Here." To face the past and protect the present, Masaomi Kida, leader of the Yellow Scarves, heads to Izaya's apartment. His intention is to discover the true identity of the leader of the Dollars, but what he finds shocks him to his core! When the Yellow Scarves, the Dollars, and the followers of Saika all gather in one place, three best friends must confront the greatest challenge to their friendship...

"I'm not doing anything. All the Dollars did that together..." The holiday isn't over yet. The day after Izaya was stabbed, the scars of the recent incident are still fresh in the city. An eccentric couple wanders the town together as a sister keeps an eye on the girl hanging around her brother. Two women--one a child, one an adult--pursue the meaning of strength, focusing their attention on the strongest man in town. A set of mischievous twins don't bother to care about their brother. A yakuza clings to his past. Meanwhile, an underground doctor just wants to enjoy a vacation with a recently relaxed headless dullahan... Ikebukuro is going to be busy!

Love and hate are two sides of the same coin. A year and a half has passed since the end of the Dollars, and now a series of assaults has the streets in a frenzy. The culprit? Someone cosplaying a character from an anime set in Ikebukuro! Meanwhile, Yahiro’s group has started solving local squabbles under the moniker “Snake Hands.” Their latest clients are Yumasaki and Karisawa, who want them to find the costumed assailant. This string of incidents also reminds the Headless Rider of the terror wrought by a certain slasher not too long ago… When people become consumed by their own obsessions, are extreme fans and extreme haters really all that different? Ikebukuro is about to find out!

New York, 1927. In a corrupt city where crime rules the streets, Firo Prochainezo is in the Camorra, an Italian criminal syndicate distinct from the mafia. Though a member of the relatively small Martillo family, Firo has big ambitions and is determined to make his mark. But while the Martillos may not be the biggest bad guys on the block, they've got some distinct advantages working in their favor. Does Firo have what it takes to become a made man? Let the crazy ruckus begin!

In his younger days, yakuza officer Akabayashi met Sayaka, the mother of Anri Sonohara, who held Saika within her...and this chance encounter changed his life forever. Meanwhile, Mikado begins a purge of the violent members of Dollars, an assassin menaces Izaya, and somehow Shizuo's getting all the ladies...?! There's never time to sit back and relax in Ikebukuro!

Ikebukuro, Tokyo-a neighborhood where twisted love prowls!! A series of street slashings in Ikebukuro begins to connect total strangers: A teenage girl with no personality of her own; a beat writer for a third-rate tabloid; a teacher suspected of harassment; an informant based in Shinjuku...and a headless rider straddling a pitch-black motorcycle!! Meanwhile, the slasher continues to terrorize the night, all in search of..."him"!?

I want to see Shizuo. Soon, soon, soon... A mysterious serial slasher has struck in Ikebukuro. The username "Saika" appears in online chat rooms in sync with the attacks. Saika-the name of the demon blade that appeared in Shinjuku years and years ago... In its chat room posts, Saika repeats one name over and over again, as though singing the praises of its beloved: Shizuo Heiwajima, Shizuo, Shizuo...

"Yahiro Mizuchi has come to Tokyo in the hopes of starting a new life (and maybe seeing the Headless Rider), but the famous Dullahan has not been seen in half a year--and neither has anyone who has gone to find her!"--