This is a story that goes back to a time when the fruits of chaos are still being formed, the cruel fates yet to be revealed.

In another volume of his journey through the Underworld, the "Adam’s Heir" will fight memorable battles and meet people who might have the answers he is looking for.

Origins, convictions, and duties. Everything will be put to the test once more.

Underworld Level -7, Restricted Block, Dead Zone

Yamir and Naomi were split away from each other by the “Wind of Death”. The snake was reminded of the old days when he wandered alone in the darkness of the Underworld. He felt empty again without the girl there.

“Wait for me…” Yamir thought.

…

Underworld Level -8, Restricted Block, Dead Zone, before Lied awakened the Spirit Mode

Naomi regained consciousness and saw Iduma standing by her side.

“Yo, I told ya we’d meet again” the kid said and grinned.

“Y-You are…” she stood up with dizzy spells.

“The great Iduma!” he introduced himself to her.

“…What are you doing here?” Naomi asked.

“And you?” Iduma answered the question with a question.

“I was with my guardian, but we got separated” she looked around for Yamir.

“Eeeeeh…” the boy had a smug smile on his face “Do you want me to help ya find your ‘guardian’?”

“Do you know this place?” Naomi asked.

“Nope” Iduma giggled.

“Forget I even asked…” Naomi shook her head.

The child removed the barrier of roots that protected her, and they continued their way until they spotted Yamir. Naomi ran happily towards him.

“You came looking for me!” the girl exclaimed in delight.

“I have to keep my promise” the snake smiled.

“Ah, this is Iduma, he saved me when…” Naomi turned to the red-haired lad and then back to the green-haired young man “Yamir…?”

He was oddly crestfallen; his smile was gone as if he had seen his worst enemy.

“Naomi…” Iduma spoke quietly.

“…move…” Yamir was saying.

Both activated their respective Spirit Modes: Iduma’s body was surrounded by a mystical white aura and Yamir’s by a dark green prana.

“W-What’s wrong with you two?” Naomi got worried.

“He’s… dangerous” Iduma and Yamir said simultaneously.

…

Ganeden, School, five minutes after Susumu and Nemo arrived in Mictlan in the island’s time zone

Time passed faster in the Underworld as 1 hour in Ganeden was equal to 60 hours in Mictlan.

A school nurse forgot a personal belonging in the sickroom and entered the closed building to retrieve it. That was where she saw a pasty-faced student lying on one of the beds.

“Susumu-kun?!” the woman recognized him.

Susumu was afterwards taken to a hospital. The young detective was carried on a stretcher to the emergency ward while his father waited patiently in the waiting room. One by one Tatsuo’s coworkers arrived at the hospital in their police cars.

“How is he, Tatsuo-san?” an officer asked him.

“I don’t know” the veteran detective replied in an apprehensive manner “Have you managed to get in touch with Nemo?”

“Who are you talking about?”

“…Yes, who am I talking about…?”

Their memory was returning to normal just like Nemo said. A few minutes later, a trio of doctors burst out of the room.

“What is it?!” Tatsuo stood up nervously from the chair where he was sitting.

“Your son disappeared!” the taller doctor said.

“Come again…?”

That was the moment when Susumu’s physical body synchronized with his spiritual body, therefore awakening the Spirit Mode.

…

7th Underworld Level, Upper Block, Administrative Floors, Secret Room

The duo Susumu and Nemo found a hidden room on the 7th Level and started an intense training led by Zosimus.

“How do you feel?” the Chains Man said after an hour.

“…Different” the detective clenched his fists.

“Uff… what now?” Nemo was panting as he stood up from the floor.

“We go to where the Illuminatus is” the human turned towards the aztec.

The Animus were divided into three types: the type C that Lied fought, tall and thin, between 30% and 35% SSL; the type B, short and thin, between 40% and 50% SSL; the type A, tall and muscular, between 60% and 65% SSL.

Halfway to Level -5, they faced a type C Animus that Susumu had no trouble defeating with his brand-new power. At the present time…

“Mr. Zosimus, is it really you?” Core took a step forward and asked.

“The man himself” Susumu’s shadow said.

“But I thought on that day, eight years ago, you were…”

“It seems that revenge didn’t let me rest.”

“Revenge…” Core said with a woeful look before glaring at Nemo “AND? What do you think you’re doing, Nemo?”

“I’m a hostage!” Nemo was hiding behind Susumu.

“A hostage?” Core mistrusted him.

“I-It’s the truth!”

“Susumu Shinichi, huh…? What kind of relationship does he have with Mr. Zosimus?” the lass thought.

Susumu tightened his tie as he gave Martyr a defiant look and the latter glanced back.

“…I feel irritated for some reason. Do you think you can help me with that?” the aztec said.

The Illuminatus member walked to the center of the floor. Pantera, Blasius, Jirou and the rest of the agog captives watched in their respective cells.

“Are they going to fight?” the hunter wondered.

“Oh, a human cop” Blasius understood that the blue-haired boy was a policeman because of his posture.

“Susumu Shinichi… Shinichi… Tatsuo Shinichi?” Jirou connected the dots related to his unknown past.

“Martyr, isn’t it? I want to ask you a question: what is your connection with Nachash?” the Chains Man spoke to the snake.

The mention of the Talking Serpent’s name alone raised the tension. All of them, except for Susumu, had heard of him.

“N-N-Nachash?” Nemo almost panicked.

“What about the Talking Serpent…?” Pantera was curious.

“Nachash…!” Core said, equally surprised.

“Who is that?” Susumu asked his own shadow.

“The man who killed me” Zosimus replied succinctly.

“What?!” Susumu and Nemo said at the same time.

“Mr. Zosimus…” Core tilted her head as she felt sad.

Everybody’s attention was finally focused on Martyr as a profound hush reigned.

“Nachash… ah, the ‘demon’ that everyone’s so afraid of. Connection? What are you on about?” the male said while scratching his earhole.

“Hm…” the Chains Man was intrigued by him, albeit he did not doubt him.

Susumu knew that he had to enquire Zosimus about everything later, including his real identity. Meanwhile, Martyr could no longer hold back his eagerness to fight. Nemo sensed his partner’s murderous intent and distanced himself from them.

“Less talk… more fight!” the Illuminatus member bellowed and moved at full speed.

Martyr tried to punch Susumu, however his fist went through him due to the Intangibility property. The snake stopped before hitting the wall thirty meters away from the teenager. Martyr noticed a light blue aura enveloping him. The aztec realized that the once ordinary human had also awakened the power of the spirit.

“Hah. Haha. Hahaha!” the Illuminatus member worked himself into a frenzy as he activated his Spirit Mode and a dark yellow prana surrounded him.

“He’s fast!” Susumu thought as he saw his opponent shorten the distance between them in an instant, the immense pressure sent a shiver down his spine.

“Can you entertain me?” Martyr whispered in his ear.

“Don’t waver!” Zosimus shouted.

Susumu regained his composure and fought back using a combination of Aikido, Jujutsu and Judo, three japanese martial arts that he learned as part of his police training. Martyr was taken by surprise as he was knocked over, but he quickly got up from the ground. Susumu was unable to dodge the upcoming biff with Visibility. The force of the blow sent him flying backwards. Blood was gushing from his nose.

“Be careful” the shadow said.

“Yeah” the teenager nodded and wiped the red liquid off his mug.

Susumu and Martyr advanced until they were face to face, eye to eye.

“I will… DEVOUR YOU!” Martyr exclaimed.

“Justice will… STEER MY SPIRIT TO VICTORY!” Susumu exclaimed.

…