[Crossover] 123, Saving the World Is Easy!

As the Chaldea Master traversing different worlds, Duanmu Shuoshi has traveled far and wide:

He once brought the oldest king (x3) to a small town called Namimori, where he befriended the future godfather destined to rule Italy.

He once summoned a famous modern Japanese writer to Japan's well-known port city, where he met the port mafia boss who held absolute sway over the area.

He once took the Flower Mage to Heian-kyo, where a hundred demons roamed, and faced off against famous sorcerers from the Gojo and Zenin clans, as well as the King of Curses.

After countless adventures, Duanmu Shuoshi gradually got the hang of saving the world and summed up a simple three-step guide:

"Step one," said Duanmu Shuoshi, "spend money on gacha... and summon reliable Heroic Spirit companions!"

Step two: transmigrate. Step three: save the world. 1, 2, 3, saving the world is that simple!

_

I tweaked the blurb because what I wanted to write has changed a bit... The planned route for now is:

Katekyo Hitman Reborn (Ring Arc) / Bungou Stray Dogs (If World) / Katekyo Hitman Reborn (Future Arc) / Bungou Stray Dogs (Original Timeline) / Jujutsu Kaisen (a thousand years ago and the 5t5 high school era) / Jujutsu Kaisen (main story timeline)

I'll add other worlds, Chaldea side stories, and interludes in between depending on how things go. The Master wants to build romantic relationships with the Servants and watch them get close to one another, and I won't hear any objections!

Also, this story will feature original Heroic Spirits. I haven't decided who will appear in some parts yet, but the ones planned to show up are listed in the blurb.

Theme: Just have fun and be happy