System: Boy, you are a ghost!

Tetsuya Kanhara: And then?

System: Join the Demon Slayer Corps!

Kanbara Tetsuya:......

[The suicidal mission has been released! ]

[As an evil ghost, you join the Demon Slayer Corps and hide your identity. The higher your status in the Demon Slayer Corps, the more rewards you will receive! ]

[Confess to the scumbag boss (Muzan) that you are a ghost hunter. If you don't get killed, you will receive a generous reward! ]

【Tell Togashi Giyu that he is hated! 】

[Tell Kanroji Mitsuri that she will never find a lover in her life.]

…

Tetsuya Kanhara: Just try to kill me!

This book is also known as "As a Ghost, I Became a Pillar", "The Traitor Most Loyal to the Boss", and "This Ghost is Obviously Very Strong But He Is Seeking Death Too Much".

The Demon Slayer arc has ended, and the second world is Fate Zero.

Monsters from different worlds gather in Fuyuki City, engaging in a battle that spans time and space.

A hundreds-meter-long dragon with wings of the sun god covered the sky.

A wielder of imperial weapons from another world, the Ice Queen who freezes time and space.

The Destroyer descends, triggers the Rumbling, and summons countless Colossal Titans.

The world's strongest man, Whitebeard, arrives!

…

After being rejected by seven or eight families in Orario, Roy unexpectedly discovered that he could travel through different worlds, just like in a game panel. He could upgrade his attributes by clearing dungeons and beating bosses.

From then on, he embarked on a road of no return to kill monsters

and upgrade. When he came to his senses, Roy had already led the Astralia family to stand on the top of the heavens. The gods would retreat in front of them.

Standing in front of you is

the terminator of the dark faction!

The leader of the strongest family in Orario!

The world hero who defeated the black dragon!

The super adventurer who broke through the dungeon!

The first god killer in a thousand years!

The king of the harem that the gods would envy!

——Roy!