NXT_MARVEL

Isagi Kawaguchi was just an ordinary guy — until he woke up in the world of Blooming Hearts, his favorite school-life romance anime. But there’s a catch: he’s reincarnated as an extra. A side character so insignificant, his entire screen time in the anime was five seconds.
But Isagi refuses to stay a background character. Fueled by the regrets of his past life — where he wasted his youth buried in books — he’s determined to live life to the fullest this time. And his biggest goal? Winning the heart of May Minase, the sweet and talented girl who captured his heart when he watched the show.
There’s just one problem. Or maybe several.
Rin Kazuki, the perfect protagonist — handsome, brilliant, athletic, and already well on his way to building his dream harem. And May? She’s supposed to fall for Rin.
But Isagi isn’t backing down. From joining clubs to standing out in class, Isagi is ready to fight his way into May’s heart — even if it means taking on the ultimate protagonist himself.
Let the battle for love (and survival) begin!

My Battle for Love in a World Where I’m Just an Extra

The room fell into an awkward silence as Rin Kazuki's presence washed over the Student Council like an incoming storm.

"Ah, Rin-kun! You're here too?" Saki chirped, practically sparkling at the sight of him.

"Of course," Rin said with a dazzling smile, the kind that looked like it belonged in a toothpaste commercial. "I thought it'd be a good chance to help out."

He turned his eyes toward May, and my blood pressure spiked.

"May-chan," he said smoothly. "Looks like we'll be working together again."

May smiled politely, but I noticed the faintest hint of discomfort. Or maybe I was imagining it. I hoped I wasn't.

Before I could say anything, Saki clapped her hands. "Okay! Let's divide into teams for festival planning!"

Naturally, I made sure to end up on May's team. Unfortunately… so did Rin.

"Alright!" Saki grinned. "Isagi, May, Rin — you'll handle the main event planning."

"So, I was thinking we could do a talent show," I suggested. "It'd give everyone a chance to show their skills and—"

"I agree with Isagi," May said, smiling at me.

But Rin leaned back in his chair, looking effortlessly cool. "That's a nice idea," he said. "But wouldn't a charity concert attract more attention? Plus, it would help the community."

Damn him and his good suggestions.

May's eyes lit up. "That's a great idea, Rin-kun!"

Later, Kaito found me slumped over my desk.

"I'm fighting a literal protagonist for the girl of my dreams. What do you think?"

"Man, you're ambitious," Kaito said with a laugh. "But hey, if it makes you feel better, not every girl falls for the main character."

I wasn't sure if that was true… but I was determined to find out.

"No problem," he said, grinning. "Just make sure this stays fun. Don't turn into one of those angsty side characters, okay?"

The battle for May's heart had just begun — and I was ready for war.

Declaration of War