My Superpower Is a Shared System

Ninomiya Kanade lives in Tokyo. He's an utterly ordinary passerby, until one day he suddenly awakens memories and abilities from his past life as a System. Then comes a shutdown (death) warning: "System energy is about to run out." Ninomiya Kanade: ...Are you kidding me? Do you have any idea how hard it is to find someone compatible with a System? This isn't a novel, where some random passerby can transmigrate, be reborn, or have a System suddenly dropped into their lap. Forced to return to his old job, the former System, now an elementary school student, grumbles to the System assistant as he opens the System map. Just as he's about to search for a suitable Host, a series of beeps sounds in his ear [Beep beep: Compatible Host "Yoshino Junpei" detected. Suitable route: Supporting Character's Comeback] [Beep beep: Compatible Host "Oda Sakunosuke" detected. Suitable route: Literary Master Development] [Beep beep: Compatible Host "Miyano Akemi" detected. Suitable route: Business Management and Child Rearing] ??? At the Beika Bank, Ninomiya Kanade looks at the shy older boy from next door, then at the quiet young man withdrawing money at the next counter, and finally at the genial bank clerk behind the counter. He decides that something about this world, or him, has to be seriously wrong. One day, besides supernatural abilities, cursed techniques, and magic, a new mysterious power appeared in this world. It was called the "System." Under the influence of the [Literary Master Development System], the black-clad gangsters of Yokohama stopped fighting each other. They now wield their pens as weapons in the Yokohama Literary Journal. A member of the mafia wouldn't dare call himself an executive without having published a few articles rebutting the enemy. Tempted by the [Hundred Demons Illustrated Card-Drawing System], the special-grade sorcerers at the technical college have no time to suffer through the long, hot summer. Come winter or summer, they diligently grind through quests, even moonlighting as the leader of the Q cult, all to collect tokens and complete their card collection. Ninomiya Kanade, wearing multiple System secret identities: Plan successful.jpg. I can retire without a hitch! ☆ Please check out my upcoming crossover fic! ☆★ "The Persecution Script-Acting Method"★ Find it in the author's collection~ After signing up for the [Writing Training Camp] recommended by a friend, Himeno Aikawa is sent to another world. He has to write scripts that satisfy the System if he wants to go home. Having chosen the basic service to save money, Himeno Aikawa studies the [Incomplete Background Information] provided by the System and falls into deep thought. First world: [Jujutsu ■aisen]. You are the illegitimate son of the Zenin clan, one of the Big Three. When the clan leader's son bullies the members of the clan, what do you do? Himeno Aikawa: Beat him up, then defect from the jujutsu world and build up the cursed spirits' side. Dark and gritty protagonists are all the rage these days. I'm an expert! Second world: [Fire ■inja]. You are the most precious creation left behind by the Demon of the Ninja World. When a schemer tries to manipulate you into carrying out the Infinite Tsukuyomi, what do you do? Himeno Aikawa: Beat him up and show him who's boss, then carry out your father's ideals. Maybe secretly find yourself a good buddy, too. I can't leave out a single trope expected of a beautiful, strong, tragic character. I can't waste this handsome face enhanced by the Uchiha halo! Third world: [Bungo ■trays]. You are a drifter from the slums. One day, passing by the river, you find a black-haired man who has fallen into the water. What do you do? Himeno Aikawa: Charge him for saving his life. If he won't pay, beat him up. You need capital to start a business. From slum rat to richest man alive, the overpowered protagonist's rise to success never goes out of style. Fourth world: [Case Closed]. You are a new fake drink at the Black Organization, surrounded by wolves. You must protect the safety of an unknown ally while making sure your identity isn't exposed. What do you do? Himeno Aikawa: First, beat up everyone I can take on. I'll become the Black Organization's most hated member, then quietly set myself a dozen or so death flags. I'll fake my death, slap them in the face, and clear my name. The tropes may be late, but they'll get here eventually. Fifth world: [Demon ■layer]. You are the third child of the Tsugikuni family. Outside, monsters and demons are lurking; inside, your father, the lord of the castle, is ready to send you to another domain as a sacrificial bride. What do you do? Himeno Aikawa: Beat him... Damn, I can't beat him. Do I have to go with the frail, tragic love-interest route? Script [The Pitch-Black Dawn] recorded. System rating: SS Script [The Fall of an Idealist] recorded. System rating: SS Script [Building a Brilliant City] recorded. System rating: SS After successfully completing every script, Himeno Aikawa happily returns to his own world. The first thing he does is uninstall that so-called training camp. However... A letter of admission suddenly arrives in his inbox, claiming to be from [Tokyo Jujutsu Technical College]. The next day, a familiar white-haired man shows up at his door, accompanied by a tiger cub who looks exactly like his cheap son. His new guardian has the same name as his cheap dad from the Ninja World. A café waiter who gets rave reviews online looks exactly like his hapless teammate from the Black Organization. A new landmark appears in neighboring Yokohama: five black buildings. The master of the dojo next door excitedly draws his sword and gets into a fight with the hat-wearing mafia boss who came to take someone away. Wait! This isn't how the story is supposed to go! Where's my aftercare?! I need aftercare!! [Reader's Guide] (This Story) 1. No romance, no secret identities revealed. The protagonist is a child at the start. 2. Canon boy-girl couples won't be broken up, such as Shinichi and Ran, and Takagi and Sato. [All other pairings are friendship-only.] 3. The timeline has been altered. 4. [Important] The Black Organization has been significantly changed to fit the worldbuilding. For example, some key members have supernatural abilities. 5. The blurb was saved on 2022/1/14. 6. Anti-piracy ratio: 60%, time limit: 24 hours. Theme: Never give up on yourself.