Here's the revised Chapter in English, with all the requested character name changes and grammatical corrections, without adding new content or altering the original meaning:
Ren opened the Group Album.
The first thing he saw was March 7th's selfie. If he remembered correctly, March 7th was a girl who loved taking photos. Hmm, the photo was very beautiful. He saved it casually.
He returned to the Chat Group interface. Thinking of something, he glanced at his own information.
[Human]: Ren Kazama
[Points]: 3700
3700 points; he had killed over three thousand zombies today. It was time to spin the roulette.
He opened the roulette function. There were various abilities on it: Sea Tiger Explosion Fist, Friendship Breaking Face Fist, Sharingan, Fire Magic, Mystic Eyes of Death Perception, and so on. There were also various items: Death Note, If Telephone Booth, Pokeball, Holy Sword, etc. The abilities were divided into levels: C-rank, B-rank, A-rank, S-rank, SS-rank, SSS-rank. The Physical Enhancement superpower and Five Thunder Rectification - Yin Five Thunder that he drew before were both B-rank abilities.
"I hope I can get a high-level ability this time!"
With anticipation, he started the roulette. One spin cost 1000 doomsday points. The roulette spun... the pointer passed over various abilities and items one by one. Mystic Eyes of Death Perception... Dragon Slaying Magic... Shrink/Enlarge Ray...
Under Ren's nervous gaze, the roulette finally stopped at a narrow position.
[Congratulations! You have obtained S-rank ability, Original Stone Vector Manipulation!]
"???"
This was a gold drop! He was excited for only a moment before he calmed down again. He knew about Vector Manipulation, a superpower from A Certain Magical Index. Among them, Academy City's number one, Accelerator, was overtly a Vector Manipulation ability user.
However, Vector Manipulation was not equal to Accelerator. Accelerator was powerful because of his strong calculation ability; even without understanding the essence of the ability, he was still powerful by treating the ability as Vector Manipulation. There were many Vector Manipulation ability users in Academy City, but only Accelerator was strong. Before his brain was injured, his calculation ability was already on the level of a particle computer.
Ren checked the ability's information.
[S-rank Original Stone Vector Manipulation]: After fusion, awaken the Original Stone ability, Vector Manipulation, to manipulate vectors.
"Original Stone!!!"
Ren's eyes widened. If the ability was just Vector Manipulation, he might have been a little disappointed, because he felt his calculation ability was not very strong. However, if it was Original Stone, then everything would be different!
Original Stone, a concept in "A Certain Magical Index." Ability users who naturally obtained their Personal Reality, also known as natural ability users. Almost ninety-nine percent of Academy City's ability users, like Accelerator, had their Personal Reality developed later. Therefore, the strength of their superpowers depended on the amount of calculation.
However, Original Stone abilities were different. Unlike artificial ability users, Original Stone abilities could be used instinctively without calculation, like a natural reflex.
Power driven like an arm!
Unrestricted use!
A simple example. Accelerator needed to calculate to change the direction of a certain force. However, Original Stone Vector Manipulation only required a thought, 'I want to change it,' just like the power of 'I think so.'
Ren excitedly took a screenshot. After fusing Vector Manipulation, he used 1000 points to upgrade it to Lv2. Then he sent a screenshot in the group.
Ren: "I just drew my ability [Image]."
March 7th: "Eh!! Ren, how do you have so many points to use the roulette? 1000 points! We only get dozens each time we sign in."
Ren: "Besides signing in, doomsday points can also be obtained by encountering doomsday factors and reducing doomsday factors."
Ren: "In my world, there's something called evil spirits, which are one of the doomsday factors. Killing evil spirits earns doomsday points."
Ren: "Also, the Doomsday Game I encountered today, killing zombies in it, also earned me doomsday points."
March 7th: "I see... But I don't even know what doomsday is!"
Exusiai: "Does that mean it's Originium for me?"
Aqua: "Hmph, then for me, it must be eliminating the Demon Lord's army and the Demon Lord."
Saeko Busujima: "I also don't know what the doomsday is on my side."
Ren: "@Saeko Busujima, it might be zombies on your side, but I can't be sure about the specifics."
Saeko Busujima: "Oh? If it's zombies, I might need to make some preparations. Thank you, Ren-kun."
She didn't doubt Ren at all. Even though Ren himself said he wasn't sure.
March 7th: "Emmm, darn it. @Ren, what exactly is your S-rank ability used for?"
Ren: "The ability is as its name implies, two words: manipulate vectors."
March 7th: "Manipulate vectors? I don't understand!"
Exusiai: "Hehe, I don't really understand either."
Aqua: "Emmm, what a strange ability, it's not as good as my divine power!"
Ren: "..."
Saeko Busujima: "..."
Damn, there are three idiots in this group now!