[Reborn!] Become an Idol for the Vongola Vindicators!

Something niche, please. The three pairings are Giotto/Bermuda/Reborn.

Your name is Coste Cozart, shortened to Coco.

You transmigrate to the nineteenth century and plan to start a business with your Rainbow Child roommate. Since you're short on money, you decide to earn the startup funds first...

Bermuda's smile froze.

The red-haired girl bounced around the plaza with a smile on her face. Below the stage, nineteenth-century locals who had been won over wore matching fan headbands and waved glow sticks from who-knows-where.

...Coco, what are you doing?! I told you to start a business, and this is how you shake up the underworld?!

You painstakingly gathered enough members for a girl group. Your cheap big brother and the Vongola kept dropping by and interrupting your money-making, but thanks to your passion as an idol fan, you still made a name for yourself and earned enough to buy your first company building.

"We can bring in talent competitions and AKB-style voting to take the first step toward capital accumulation." The red-haired girl wore a devilish smile. "Even if you spend a fortune, your fave might not get picked, but if you don't spend anything, they definitely won't!"

"It's a win-win for the cash cows, no, our supporters. The idols get great opportunities, and we get a mansion by the sea."

Then a fight between Checker Face and Bermuda blasted you into the modern era. At the time, all you had time to do was give Bermuda a brief farewell. In tears, you told him to make sure he kept growing your business.

Looking at the huge logo of Vongola Entertainment on a government building in the twenty-first century, and the ruling political party named after you, the Coco Party...

You: ?

The nineteenth-century arc runs from Bermuda becoming a Rainbow Child to Checker Face abandoning him. Everything after that is set in the modern era. This will probably be a long novel.

Theme: Don't rewrite history!