Reincarnated as Shiro Oni in DXD

Yuzuru then sat down on the tatami and said, "Heyy system are you there?

Then a cold mechanical voice was heard which Yuzuru thought sounded like the AI voice that he usually heard in short video clips. Then a transparent blue screen appears in front of Yuzuru.

[Welcome Host!]

[Host: Yuzuru Yamazaki]

[Statistics]

[Strength: F+]

[Endurance: D-]

[Speed: F]

[Intelligence: D+]

[Skills & Ability: Reverse Eyes(C)]

[Inventory:-]

[Mission:-]

"Hmmm, quite good" Yuzuru nodded his head.

"System, about the inventory is it can only be used to store rewards from system?" Yuzuru asked.

[That's right Host]

Yuzuru thought for a moment then said, "Is there a beginner's package or something?"

[No]

[But, I can give you a mission]

Yuzuru immediately said, "give me that."

Yuzuru now needs something that can make him strong in order to survive. He doesn't know what fate will do to him if he's weak. But, he knew that if he continued to grow stronger then he would be able to control his own destiny.

[Accepted]

[Mission has been released!]

[Mission: Stop the police and yakuza pursuit!]

[Rewards: Hanma Bloodline, Shadow Boxing Technique (Baki)]

Yuzuru's expression was unreadable after knowing his mission and he thought, 'I can ask for help from that old man Magami for the police while for the Yakuza I can do it myself but I can't beat the leaders of the 3 families. This mission is practically impossible even for me.'

Yuzuru was silent for a moment before saying, "System, this mission doesn't make sense even to me."

"Unless you have something that can help me"

Yuzuru remained silent waiting for the system's answer for a while until a cold mechanical voice sounded in Yuzuru's mind.

[Compensation has been given!]

[Statistics multiplier card(30 Minutes)]

[Gun Park's memories card]

Yuzuru's eyebrows furrowed for a moment then he said, "Well that's better."

"System, use the memory card now"

[Host will feel intense pain when receiving its memory]

[Continue to use?]

[Y/N]

Yuzurh took a deep breath and then said, "Yes, use it"

[Starting the planting process...]

For 5 seconds, Yuzuru didn't feel anything.

"Sys-" Just as Yuzuru was about to say something, he felt a sharp pain and dizziness in his head.

"Grrr" Yuzuru growled and clutched his head as it felt like it would explode at any moment.

In the pain that felt endless, Yuzuru felt his vision blur and his consciousness slip away. But he banged his head on the tatami in order to maintain his consciousness.

The pain continued for 30 minutes until it finally subsided. Yuzuru was panting and sweat was pouring down his temples. Then Yuzuru heard a voice in his mind.

[The planting process was successful!]

[Congratulations Host!]

Yuzuru fixed his position then sat quietly with his eyes closed and seemed to be thinking about something.

Yuzuru stood up, his face looked like he was thinking about something seriously then he walked out of the room and walked towards the yard.

In a fairly spacious backyard, Yuzuru stood alone under the bright sky. He had taken off his hoodie and shirt, leaving only his dark pants. His posture was firm, muscles and countless scars visible under the sunlight.

A gentle breeze rustled the leaves around him, but Yuzuru was undisturbed. He took a deep breath, letting the fresh air fill his lungs. His hands slowly rose, forming a solid stance. In the silence, only the sound of rustling wind and his steady heartbeat accompanied him.

Suddenly, he moved. His body darted forward with incredible speed. A punch shot straight ahead, accompanied by the sound of air splitting. The movement was followed by a powerful front kick, striking the air with perfect precision. Without pause, he spun his body, launching a circular back kick as if facing an invisible opponent.

Every movement was executed with full power, yet remained controlled. Yuzuru repeated his techniques over and over. With Gun Park's experiences etched into his mind, he refined the smallest details—the position of his feet, the direction of his punches, even the rhythm of his breathing. Although Gun Park's experiences were in Yuzuru's memory, they weren't embedded in his muscle memory. He knew that in this solitude, he was challenging himself to reach or perhaps surpass Gun Park's level.

Yuzuru didn't stop there; he trained more complex combinations, testing the limits of his strength.

Sweat dripped from his temple, running down his body. Time passed, but Yuzuru paid no mind. To him, this training was more than just a routine—it was meditation in motion. Every punch, every kick, every breath was part of the harmony he created on his own.

When he finally stopped, his body stood upright with his arms at his sides. His breathing was steady, his face calm, even though energy still coursed powerfully through him. In the stillness of the backyard, Yuzuru contemplated the upcoming battle against the three family heads. He thought he might win if he used the stat multiplier card, but if something unexpected happened, he could risk dying there. Still, Yuzuru had no intention of stopping because, to him, life was a gamble—and if the bet was victory, he would only grow stronger.

Yuzuru then went to take a shower because he was sweaty and wanted to go straight to the Magami Syndicate to make a deal and have a little chat.

After Yuzuru took a bath he put on his clothes from earlier. He put on his hoodie and dark pants, then he went out of the house but before he went any further from his house he stopped his steps and looked back and stared at his house then muttered in a low voice, "Well let's see what lies ahead"

After that Yuzuru continued his steps and moved away from his house. Yuzuru walked towards the nearest train station he knew by asking people he met until he arrived at the train station. He waited for a while to board the train to Tokyo.

It was evening and Yuzuru was sitting on the train looking out the window. After that, a notification was heard that the trip to Tokyo would take 4 hours and Yuzuru decided to sleep to overcome his boredom.

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Well maybe from here there will be a little change because I will make him more serious and I need your advice about his partner. Do you think Yuzuru should have a harem or not? And if yes, then is it a small or large harem?