After the somewhat noisy and immoral incident that occurred under Akira's office desk.
The underground laboratory of the Akatsuki Trading Company was filled with unprecedented tension and heat.
On the experimental table, inside a special barrier, lay the Blue Spider Lily. The phantom white flower that Muzan had craved for nearly a thousand years emitted a faint blue light.
To refine this flower into a perfect medicine, the best minds and supernatural abilities of Akira's faction had gathered.
"Mikon~ This flower is indeed extraordinary. It holds the sun's energy, but its essence is close to the extremely sinister nature of demons. A yin that contains yang energy—if we don't fuse this duality with sorcery, it will become poison."
Tamamo floated talismans in the air, adjusting the flower's energy. It was a delicate task that made sweat bead on her forehead.
"Then we'll take charge of the delivery system for the medicinal efficacy."
"Compared to poison, the difficulty is higher."
The genius pharmaceutical knowledge of the Kanae and Shinobu sisters was put to use as they alternated between microscopes and reagents to mix the components.
In a bubbling beaker, purple and blue liquids were mixing.
"Leave the toxin removal to me. Even in Enra-ku, I've never handled such a precious plant, but the principle is the same! I'll try frying to remove the poison and boiling to preserve the medicinal properties."
Benienma, a cooking expert and hell's jailer, removed the flower's impurities with more precise hand movements than anyone else.
And finally, from one corner, Shuten, who had been watching them while gulping down sake from a gourd, wiped her mouth and spoke hoarsely.
"Hey, step aside a bit. This demon body thing isn't as simple as you think. It's damn complicated, you know?"
Shuten, the pinnacle of demons, flashed her red eyes and peered at the mixture Kanae had made.
"It's not something you can just stuff sun energy into. You need a catalyst that burns the bones and completely overhauls the blood. I'll mix in a bit of my Divine Demonic Poison Wine. With this, the demon's blood will boil, and the medicine will take effect properly."
"Huh? Isn't that a deadly poison?"
When Shinobu asked in surprise, Shuten grinned.
"Poison is medicine, you know. If he can't handle this much, he's not our master. Right? And, I handled it just fine myself."
A true demon, and beyond that, a being who would reach the realm of gods as a complete life form. He must accept and grow with the power of the gods.
Shuten's bold advice, Benienma's cooking methods, Tamamo's sorcery, and the Butterfly sisters' medicine were fused. Weeks passed with day and night research.
Finally, the day of decision dawned.
With trembling hands, Tamamo handed a small glass vial to Akira. Inside, a liquid swirled strangely with blue, gold, and red lights mixed together.
"Master, it's complete. Named the elixir for overcoming the sun and body transformation, Ichi Rin (日輪)."
"If I drink this, it's over?"
"Yes. Theoretically perfect. I, no, all of us guarantee it."
Akira nodded and took the vial. The gazes of everyone gathered in the laboratory focused on him.
Meanwhile, Mukago, who was serving and had crumpled in a corner, chewed her nails anxiously.
'That, that thing looks incredibly dangerous just from the color… What if he dies after drinking it?! If the master dies, what about me? My livelihood?! Please don't die, please! Since we're connected like with Muzan, I might die too!'
Ignoring Mukago's desperate prayers, Akira gulped down the liquid in one go.
Gulp.
The swallow was refreshing, but immediately after.
Crack! Thud! Crunch!
"Kyaaah──!!"
A terrible tearing sound erupted from Akira's body.
He screamed and collapsed to the floor. A burning sensation as if molten lava was being poured into all his blood vessels, a destructive pain that broke and reassembled every joint.
"Akira-san!"
"Father!"
Mitsuri and Kanao tried to rush forward in shock, but Shuten blocked their way.
"Hey! Stop! You mustn't approach, you know?"
"Move aside! Akira-san is…!"
"Let him be. That's not dying. It's called bone replacement and body transformation. The process of completely destroying and reassembling the body that was imperfectly turned from human to demon, to make it into a higher-dimensional being. If you disturb him now, the energy will get messed up, and he'll really die."
Shuten, an expert in this field, declared confidently while watching Akira with her divine eyes through her godly perception.
The time of pain felt like an eternity, but it was only about ten minutes. The blood that had erupted from Akira's body was sucked back in through his pores.
Swoosh….
His rough breathing stabilized, and Akira slowly raised his body.
"...."
He had changed. The pale skin characteristic of demons had turned into a healthy, vibrant apricot color, and the horn on his forehead had disappeared. When he opened his eyes, deep black pupils that seemed to contain the universe were revealed instead of red irises.
"Amazing…."
Akira placed his hand on his chest.
Thump, thump, thump, thump, thump, thump, thump, thump, thump, thump.
Ten hearts beat powerfully like engines, supplying infinite vitality throughout his body. Seven brains and ten hearts surpassing Muzan. He was now a creature beyond specification.
"Akira-san…? Are you okay?"
When Mitsuri asked tearfully, Akira smiled warmly and ate the cherry blossom rice cake she offered.
"Delicious. The sweetness of the red beans and the saltiness of the cherry blossom leaves… My sense of taste has returned."
A being possessing both human senses and demon power.
Akira immediately went outside. Under the pouring noon sun, without Tamamo's sorcery, he did not burn.
"Ha… Hahahaha!! Success! I've overcome the sun!!!"
Akira's shadow was clearly cast on the ground. The Servants also cautiously came outside and confirmed that they too had gained sun resistance due to their master's evolution.
"Sun resistance, immortality. Kehehe! Blood Demon Art! Hahaha! With this, I've become a complete life form! Pitiful demons! I'm not afraid at all now! Kneel before me and our power! Kehehehe."
"Master, you're spontaneously spouting lines."
"Shh, be mindful, Nobbu."
Nobunaga quipped at the familiar line, and Okita hit the back of her head while telling her to be mindful.
"I am now truly invincible in this world! I have no weaknesses now! Even if my neck is cut, even if I'm hit by a nucleus, even under sunlight! No one can harm me. The birth of the complete life form, the ultimate being Akira!"
"He's feeling high, that guy."
"Master, I understand you're happy, but that's enough. From a bystander's perspective, it's a bit embarrassing."
Nobunaga and Okita, who were less smitten, said to Akira, and Akira chuckled and turned around.
"Today is my new birthday. Everyone, prepare a banquet!"
That night, an unprecedented grand banquet was held at Akira's mansion.
"Um, Master. Does that mean we can also overcome the sun?"
"If you drink my blood, yes."
"Then, could you share your blood with us?"
"Depending on how you behave."
"I'll work hard!"
The opportunistic Mukago, realizing Akira's change, begged him to share his blood. If they drank his blood, if he shared his power, other demons could also overcome the sun.
Mukago decided to work hard to become stronger and rise to the rank of Upper Moon, and to overcome the sun through diligent effort.
Similarly, the opportunistic Kumohime also decided to work hard to receive Akira's blood.
On the other hand, Kumonojo and Kumoeimon seemed largely uninterested. They were satisfied with their current life.
Ubume also showed no particular ambition, simply following Akira's will.
Meanwhile, his women exchanged glances.
As the night deepened, the banquet venue moved to Akira's large bedroom.
There, all his lovers had gathered.
The air was sweet and humid.
Kiyohime and Tamamo Cat tried to rush forward first, but Tamamo snapped her fan shut and stopped them.
"Wait a moment. There's an order."
"Huh? As for order, shouldn't I, the first wife, go first?"
Kiyohime grumbled, but Tamamo smiled leisurely.
"Right now, Master has become a complete life form and is overflowing with power. If Servants like us charge in first, he might lose control and go berserk from not being able to handle that power. So…."
Tamamo's gaze turned to the human wives: Mitsuri, Shinobu, Kanae, and Tsubaki.
"The delicate and soft human wives should first receive Master to warm him up a bit. That way, Master can learn to control his strength. Right?"
"Hey, Tamamo is right. If we go first and can't control our strength, we might destroy the house. Let the weak ones do it first thoroughly."
Shuten also chimed in while sipping sake.
At those words, the faces of the four human heroines flushed red. But they didn't seem displeased.
"Then, then… I'll check first! Because I want to hear Akira-san's heartbeats!"
The first to step forward was Kanroji Mitsuri.
The coolness characteristic of demons had vanished, replaced by a hot body temperature. Akira gently embraced Mitsuri and kissed her.
"Should we just do it simultaneously?"
"Well, an orgy is a bit… but it's hard to wait."
Next, the Kanae and Shinobu sisters approached.
"Oh my, Akira-san. It seems you won't go easy on us today?"
Finally, Tsubaki shyly approached.
"Ma, Master… me too…."
Akira patted Tsubaki's head, and looked at the women clinging to him.
"Then, then… I'll check first! Because I want to hear Akira-san's heartbeats a lot!"
The first to step forward was Kanroji Mitsuri. She untied the collar of her yukata, revealing her ample cleavage, and nestled into Akira's arms.
"Aah…! Akira-san, your body… is so warm…♡"
The coolness characteristic of demons had vanished, replaced by a hot body temperature.
Akira gently embraced Mitsuri and kissed her. Even Mitsuri, who had the peak human physical strength, was helpless before Akira's endless stamina.
She screamed and reached climax several times before collapsing limp in Akira's arms.
Next, Shinobu swallowed saliva and leaned her body, but as Akira's touch reached her, moans immediately escaped. Kanae softly accepted Akira and felt the changes with her whole body. The breaths of the two sisters grew rough, and the room filled with hot heat.
Simultaneously with the Butterfly sisters, Tsubaki also took the lead. Tsubaki, who embraced Akira with trembling hands different from when holding a sword, also fell before Akira's stamina that transcended humanity.
When the four human lovers fell asleep exhausted in ecstasy, the eyes of the Servants watching from behind gleamed.
"Hmm~ This much warm-up should be enough, right? Now it's time for the real ones to step up, right?"
Shuten approached seductively, licking her lips with her tongue.
"Mikon! Master, from now on, no holding back, right? We're sturdy!"
Tamamo wagged her tail and jumped into the bed. Following her, all the Servants rushed into his arms at once.
"Alright. Bring it on. Until all of you faint, my heart won't stop."
Akira laughed heartily and accepted them.
All night long, the bed creaked, and fierce love that could make the building shake continued.
Even the Servants who transcended humanity were insufficient before Akira, who had become a complete life form.
Around dawn.
The bedroom had changed like a battlefield wasteland. The mighty Kiyohime and Tamamo were sprawled out unconscious, and even Shuten raised a white flag while holding her waist. Cat was convulsing with her butt raised, and Benienma had her stomach filled to the point where white turbid fluid flowed from her mouth.
Okita and Ushiwakamaru couldn't even get up as if their backs were broken, and Nobbu was face down on the bed with an ahegao expression. Next to her, Oei was unconscious from magical energy saturation, and next to her, Toto-sama was also collapsed. Oei had fainted, and using her body, Akira had done it anyway.
Mitsuri and Tsubaki were sleeping piled up with happy expressions, and the Butterfly sisters were also sprawled on the floor together. Next to them, Ubume was also sprawled out. Since she was a demon, she was played with like the Servants, so her body was a bit twisted. Of course, it would recover, so no problem.
Truly a bedroom with the smell of night flowers and white magical energy saturation.
Akira swept back his sweat-drenched hair and got up from the bed.
"Phew, refreshing. I feel like I haven't used a few hearts yet."
He was still full of energy. Approaching the window and looking at the rising morning sun, Akira clenched his fist.
"Now, shall I leisurely take revenge on Muzan? First, let's open a few shops in the Yoshiwara area."
Now is the time to take revenge on Muzan. The time to take revenge for his family and village people has come. To do that, he decides to eliminate his limbs first.
The first target is naturally Upper Moon Six, the Shabana siblings.