The Daily Life of the Demon King Matsuda

Matsuda blinked, and the police officer had gone from the Ferris wheel to four years in the past.

He blinked again, and the police officer who had died in the line of duty, Matsuda Jinpei, had arrived in Heian-kyo.

His eyes... neither closed nor opened, and the Demon King Matsuda returned to the side of his classmate.

One day.

This might be torture for the undercover Bourbon, but for Furuya Rei, it was just right!

After waking from a nap, Amuro Toru faced an epic choice.

Option A: A seven-year-old Hiro, perfectly well-behaved, cuddling his left arm and fast asleep.

Option B: A seven-year-old little curly-haired boy, mumbling about bombs and clutching his right arm in fear.

Meanwhile, his phone received an urgent mission alert...

At that moment, Furuya Rei had never felt such a strong urge to destroy the Organization.

Simply put, little Jinpei had two chances to be reborn, and became the kind of Demon King seen in Demon Slayer. There are no romantic pairings, just the brotherly bond between childhood friends, in the Detective Conan sense of science!

Theme: Changing the future means changing the present