What's So Strange About Saving the World with Black-Side Cards in a Crossover?

He transmigrates to another world with a Card System bound to him. Apparently, his goal is to collect cards and save the world along the way?

And so, you get to see...

The Ten-Thousand-Year-Old Elementary Schooler: "We can't let the real culprit get away... Who could the culprit be?"

Chang'an's Security Officer: "He's the culprit!"

The White-Haired Strongest: "It's fine. You're weak, after all!"

The Carefree Dreamer: "I never looked down on this world. My standards are just a little high."

The World's Greatest Detective: "I really don't understand adults. They're like babies who can't think."

The Musical Prodigy: "Adults are evil, terrifying creatures who love to lie. Hmph!"

The Great Demon Lord Teacher: "Stupid Tsuna still needs more training."

An Ordinary Person Named Fifty-Eight: "I'll help you."

There's also the morally ambiguous strategist who speaks in nightmares, the former assassin of Wei who transformed into a shark, the mysterious keeper of butterflies in the clouds...

Everyone can't help but look at them with confusion. "Are you really here to save the world...?"

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.