Unparalleled Glory

Douma had always thought his previous life was, to put it simply, utterly boring.

Even at the moment of his death, human emotions still left him completely unmoved.

Until one day, he was unexpectedly told:

[You can experience a new life]

In a real human body, he would become that child's guardian.

Watching him go through despair and rebirth, step by step, and never give up hope, even after all they'd been through,

it seemed... rather interesting.

Sawada Tsunayoshi had always felt that the man with the carefree smile wasn't as simple as he seemed.

Even so, he couldn't simply define him as an "evil person."

He was just longing for the simplest, most genuine kind of affection.

Or so it seemed.

Reader's guide: * I will not whitewash the second-in-command (the first villain I liked who was purely evil).

* The pairing is indicated by the character names.

* Later, they transmigrate into Demon Slayer, where Douma appears.

* A crossover with The Prince of Tennis, Kuroko's Basketball, and Bungo Stray Dogs. Characterization may be out of character.

Theme: When an ice-cold demon who cannot empathize meets the Tenth Vongola boss.