Note: This story is a crossover between Persona 4 and Digital Devil Saga.
Pairings are as follows: SerphxRise, YosukexSaki, HeatxSera, CieloxChie, NaotoxGale, ArgillaxKanji, Varin/Colonel BeckxAdachi and YukikoxYu.
Six members of the Vanguards Tribe stood guard in a hallway on a military cargo plane that belonged to the Embryon Tribe, whose personnel on-board were the pilots and the Tribe Leader, Serph. The plane was currently flying above Japan and would reach its destination at Tokyo International Airport in about ten minutes. The day was April 12th and it was currently early in the morning. Very suddenly explosions and gunfire could be heard from elsewhere in the plane.
"[The Brutes have snuck aboard! All Vanguard soldiers are to eliminate them on sight. They cannot be allowed to reach the cargo.]" Serph transmitted from the cockpit.
As the Vanguards scoured the plane for members of the Brutes Tribe and eliminating most of the soldiers afterwards, some of the Vanguards' own soldiers ended up dead after falling into a few ambushes set up by the Brutes, two missiles struck the plane.
"[Varin has decided to shoot down the plane since he can't get the cargo! We need to make an emergency landing!]" a pilot transmitted.
"[The cargo area's been breached! We can't hold!]" a Vanguard soldier transmitted.
With a violent lurch, the plane narrowly dodged another missile by heading to the left, but in the process several spherical containers that were steel with two glass windows running down from the top of the upper half to where the two halves meet fell out of the plane. Where the two halves of the containers met was pure steel, but the glass would break on contact with the ground at the height from which the containers fell. This was bad since the containers held a gas that was purple in color that barely lingered in a wide area for longer than five seconds but in a tightly-packed area like the containers, it could stay for several days before dissipating. The gas, if a human was exposed to it in sufficient amounts, was a vector that would infect the exposed human or humans with the Atma Virus. Once the Atma infection began, an Atma Brand would appear somewhere on the human's body and when taking on the Atma form, the brand glows and veins would shoot out from it across the person's body. Another symptom of an Atma infection was a never-ending hunger that weakened an infected person if they resisted it and if the hunger was not satiated for long enough, the infectee was permanently transformed into the Atma form.
"[Is something wrong, Serph?]" Gale transmitted from the airport.
"[The Brutes attacked and tried to get to the cargo, but we've taken them out. Some of the containers fell out when the Brutes simply tried to shoot us down though, but we still managed to hold four of them inside.]"
"[That's good. We won't have to delay anything now. Stay careful.]"
"[Understood.]"
Meanwhile, as Yu Narukami walked to school, he noticed a blonde student riding a bike crash it into something and the student grimaced in pain. Deciding to help the student, Yu was thanked for helping him and the guy introduced himself as Yosuke Hanamura. Yosuke then took off on his bike after he said that he'll meet up with Yu at Yasogami High and Yu knew that he was going there anyway. Once Yu was at the entrance of the school's classroom building, he saw Yosuke talking with three girls, one of whom had short hair and wore a green jacket, another who had black hair and a red sweater plus black. . . tights, he guessed while the last one had long way light-brown hair and dark tan skin. Suddenly Yu heard a crashing sound nearby and saw a spherical container had landed on a house, the glass windows on the container broken and a purple gas leaking out of it. Looking upwards, Yu saw another container coming down and it crashed right in front of Yosuke and the other three girls. On impact, the glass windows on the new container broke and the gas inside leaked out.
The gas overwhelmed Yu as he was also in front of a broken window. He couldn't see what was going on with Yosuke, but apparently it wasn't good since he heard the blond guy say to one of the girls, "Agh! What's going on!? This hunger- it's- I can't control- get Sempai away from me! Argrrh!" before Yu saw Yosuke struggling on the other side of the container and managed to notice a brand glow on his right arm as veins shot out from it across Yosuke's body and he took on the form of a demon. Yu himself also felt a strong hunger and could not contain the demonic power as it transformed him.
Sirens could be heard as Detective Ryotaro Dojima and a few other officers arrived at the entrance of Yasogami High. There were bodies and chunks laying around and apparently reports of the violent incident that had occurred at the high school had also happened elsewhere in Inaba. Searching around, he found Yu unconscious in front of the steel container that had crashed in front of the classroom building. Yosuke was also found unconscious, but he was inside the building on the second floor as was the short-haired girl and the female with dark tan skin, the one Yosuke had called Sempai.
"This is Dojima. I've got confirmation that Yosuke Hanamura, Chie Satonaka, Saki Konishi, and Yu Narukami are unconscious. Unclear if Yukiko Amagi is anywhere nearby." the detective said on the police chatter.
"Another officer found her in the Central Shopping District. She's also unconscious. Return to the station, Dojima."
'Damn, this is just not my day.' Ryotaro thought to himself as drove his unconscious nephew to the police station along with Yosuke, Saki, and Chie, all of whom were also unconscious.
Later that day, when the time read 14:00 hours in military time, a man with red hair wearing a strange uniform and a cape came in and asked Dojima, "I take it that you currently have five young adults here, all unconscious? My name is Heat."
"Yes, Heat. I'm Detective Dojima. What business do you have with them? One of the unconscious teenagers happens to be my nephew. His name's Yu Narukami."
"My leader Serph sent me here to find out if the violent incidents in this town were tied to this." Heat said as he revealed a small computer on his arm that detailed an unnamed member of the Embryon tribe violently transforming into a Momunofu in a video that Dojima watched.
"Unfortunately, the incidents are tied to what had happened in that video I saw. We're not sure what was going on."
"I don't like to tell you this, Dojima, but. . ."
"What is it?"
"I'm afraid that your nephew, along with those other teenagers, have been infected with the Atma virus."