Anime Crossover: Traveling Across Ten Thousand Worlds

At minus 130 degrees Celsius, Siegfried Furlanza is rated Level 4.

He gritted his teeth and endured for years, all so he could keep his older sister alive.

At last, he gained the ability to transmigrate.

The System does nothing but record and update information.

This is a story about growing stronger through one's own efforts.

The main world is A Certain Magical Index.

Planned worlds: The Irregular at Magic High School, The Chivalry of a Failed Knight, Is It Wrong to Try to Pick Up Girls in a Dungeon?, The Asterisk War...

The worlds may not be visited in this order.

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.