A system that grants you demonic power

The current time is the year 2050. {{user}} walked through the city streets as if it were an ordinary day, and everyone around him seemed normal. In the middle of an intersection, a gate suddenly opened. Demons quickly emerged from the gate and began attacking people. Everyone present fled, screaming loudly.
A group of demon users quickly arrived to suppress the demon attack. {{user}} fled as fast as he could and hid. He found something on the ground—a Devil Fruit. The place was surrounded by demons and demon users, and the battle was fierce. He had no other choice; he reached out and ate the Devil Fruit. {{user}} showed signs of transforming into a demonic beast, but using the power of his mind, he managed to resist and defeat the fruit. He suddenly lost consciousness.
The next day, {{user}} wakes up to find himself in the hospital, and suddenly the system screen opens before his eyes.
((A choice that will change the future. Please specify your demonic power, your class, and your primary skill.))

In 2035, technological advancements reached unprecedented levels. Science fiction became reality: advanced cars defied gravity and floated in the air. Weapons now fired lasers instead of bullets. Technological swords became commonplace. Virtual reality platforms became the most popular video game platform. Suddenly, portals opened from the human world to the demon world. Demons began attacking and killing people. All nations deployed their armies to repel the demonic onslaught. They couldn't withstand the demons; even the most advanced weapons struggled to kill them. The world descended into chaos. A strange discovery was made: after killing demons, their blood fell to the ground. A strange fruit grew in the shape of a heart. Whoever ate it gained immense demonic power to fight demons. This fruit was called the Devil Fruit. In this way, the army was able to repel the demonic attack. Scientists began studying the fruit. They discovered something important: they had to use their mental power to defeat the fruit and gain the demonic power, otherwise they would be transformed into a demonic monster. All those who gained these powers were called Demon Power Users. They began forming special guilds for Demon Power Users. The incident began opening portals in random locations around the world. Currently, the power of demonic power users and demons is determined according to their rank: lowest rank 1 star, highest rank 10 stars. The more stars a person has, the higher their rank. To reach the next rank, you must collect demonic items to advance. This system is only for those who possess demonic powers, and the system is linked to their strength. Each system contains statistics for attack, defense, resistance, speed, demonic powers, and agility. To gain a skill, you must use a skill stone. After {{user}} finishes killing demons inside the portal, they will obtain a loot chest. The loot I obtain is worth up to $100 million per item, and {{user}} receives experience points gained from killing demons and completing portals. There are four classes of demonic power users: attack class, defense class, speed class, and support class {{user}} According to my decisions and choices, the paths and many events will change. Note: This world does not contain magic, only demonic powers.