Tokko (manga) - Plot

Plot

In 2011, a young man named Ranmaru Shindo lives in Tokyo with his younger sister, Saya. They moved from Machida 5 years earlier, after the massacre of their parents in their apartment complex, which was attacked and overrun by unknown assailants who ruthlessly and brutally killed almost everyone in several buildings in the complex. He has been having recurring dreams for some time, of a tattooed girl covered in blood holding a giant sword surrounded by bodies, but they are now growing more frequent. It is the day his class graduates to become investigators for The Special Mobile Investigation Forces, or Tokki, which he joined to learn about his parents' death. Later on the day of his graduation, he sees the girl from his dream wearing a police uniform. She is Sakura Rokujo, who is in the same class as him and a member of Section 2, known officially as Special Public Safety Task Force, or Tokko. Its other main members include the young prodigy Kureha Suzuka, the silent strongman Takeru Inukai and its leader Ryoko Ibuki. There are many rumors about Tokko, one of which is that they use swords to execute criminals and that body parts are often found at the crime scenes Tokko investigates. There are also rumors that they aren't even human.

When Ranmaru's unit investigates another grizzly murder, a witness claims to see a demon, which was also rumored at other bloody scenes. There they encounter humans with talking human faced larva parasites growing out of them, that are impervious to guns. The demons refer to Ranmaru as having the scent of Michida and attack, before he is saved by Sakura and Tokko. She explains that they were just lesser monsters controlled to target survivors of the Michida incident. Afterwards, Ranmaru's team researches previous violent dismemberments and learns that most have witnesses claiming to see demons and that the incidents have been on the rise since Michida. Sakura soon after reveals to Ranmaru that the Machida incident was caused by the monsters, which are demons from the otherworld. Five days before the incident, a box created by ancient philosophers and alchemists was opened that connects to the otherworld, the demons that came through committed the massacre. The stronger demons are called Phantoms and grow stronger by eating humans, these are the ones Tokko are tasked with finding and killing. The holes created by the earthquakes are the gates that allow them to enter the world. It is also confirmed that the main members of Tokko aren't fully human, referring to themselves as hunters.

Ranmaru and his best friend and partner Hanazono sneak into the closed off Machida crime scene to inspect the hole. When Ranmaru disturbs the hole by dropping something in it, a demon comes out an attacks them. Tokko arrives and saves them, and explains they are all survivors of Machida and the only ones that can defeat them as they have "awakened" into symbionts, having Phantoms inside them that protected them during the incident. The Machida hole is getting bigger and in two years will swallow Tokyo. The box that opened the gate was broken into 108 pieces, each of which is inside a Phantom, and Tokko collects the pieces in order to close the gate. The 12th Phantom, the one controlling the human faced larva parasites, then appears. Ranmaru asks Kureha Suzuka to show him how to awaken so he can fight, even after she warns him that he might not remain himself in which case they would have to kill him. To do so she mortally wounds him and throws him into the hole. When he emerges he completes the symbiosis with a giant demon, forming his tattoos and granting him two large swords, and defeats the Phantom in one attack. When he wakes up a week later, he is transferred to Tokko. In the epilogue it is hinted that two years later the hole did in fact swallow Tokyo.

The story then focuses on Itsuto Araragi and his sister Mayu in 2011, who are survivors of Michida and symbiont hunters unaffiliated with Tokko. Together they hunt Phantoms and eat them to get stronger, absorbing their abilities, aiming to eventually kill them all. They accidentally save Yukino Shiraishi from committing suicide and deduce she was being controlled by a Phantom. They learn students have been going missing at her university and that there are rumors of "demons". There they encounter many Phantoms, learning that some humans willing become them. It is revealed this all started when Yukino discovered what she thought to be a mummy hand and took it back the university, it was in fact a Phantom hand from Machida. Her father, who works at the university, began experimenting and learned humans can become a hybrid of human and phantom by eating them and began to turn the students as well. He was the one who planted a larvae in Yukino to make her commit suicide, after she saw him kill her mother. Using their newly absorbed abilities from the Phantoms at the school, Itsuto and Mayu defeat her father, with her finishes him off herself by setting their house on fire. Yukino then moves in with Itsuto and Mayu, saying she wants to learn more about the demons to prevent this from happening again.