This includes, but is not limited to, Nexus, GBC, The Disastrous Life of Saiki K., Fate, Saya no Uta, A Certain Magical Index, A Certain Scientific Railgun, Delusion of Demons, My Go, Monogatari series, JoJo's Bizarre Adventure, Hentai, Oregairu, The Melancholy of Haruhi Suzumiya, CLANNAD, Steins;Gate, Clash of Clans, Jackie Chan Adventures, etc. Less popular works will be explained. Some stories are already completed, so the protagonists don't have much of an informational advantage. You don't need to have read the original work. (The author is not from the debate circle.)

One day, an unprecedented change occurred simultaneously in various parallel worlds, and a significant portion of the creatures and environments from multiple worlds merged into a completely new world for unknown reasons.

Even in Academy City, which lacks a magical aspect, many main characters have gathered.

Saiki Kusuo's carefree life is over; Emiya Shirou is panting as he heads to the next place where someone might be murdered; Kamijou Touma has mysteriously disappeared; and the peaceful girls' band is no longer ordinary...

And there are the alien beasts that evolved with human fear, Saya, a Cthulhu-type creature capable of transforming all of humanity into fleshy monsters, Kars, a perfect creature released from space by a mysterious force, and Haruhi Suzumiya, who is being targeted by the chairman of Academy City...

With the arrival of Jiuyang Jiuxing, the transmigrator targeted by Nyarlathotep, this new world has undergone some tremendous changes.

He will also unravel various mysteries step by step, and face one disaster after another with his trusted friends.

[No system] [Relaxed] [Combat] [Daily life] [Critical thinking] [Intellectual battle]

Good news, I was killed by a train at home.

Even better news: he's become the navigator of the train.

Even better news is that you can travel to the world of anime by train.

What pioneering and interesting things did you do after becoming a navigator?

She was paired with Kirito.

Adopting Lolis from All Over the World

Discussing the relationship between monarch and subjects with a famous queen

The birth of the king was celebrated with a cannon salute; God was lured onto a train; and Shiori almost fell in love with him.

Do these count?

Worlds experienced: Sword Art Online, Black Bullet, Akame ga Kill!, Date A Live, High School DxD, Guilty Crown, Academy Battle, Accel World...

(P.S.: The world-building is mostly from older anime series, with fewer newer ones.)