You Won't Believe It: I Transmigrate Everywhere to Save the World

[Quick transmigration + ensemble cast + alternate setting + multiple worlds + comedy + passionate action + wish fulfillment]

A refined violin melody begins to play.

Humans have... Sorry, force of habit.

The System has three great desires: to transmigrate, complete missions, and return.

And, well...!

Missions are completed to earn points and sustain the basic needs of survival while transmigrating. After completing exciting missions, spending the points you've saved on items and return rewards brings spiritual pleasure and a sense of fulfillment.

Also, ahem... Some people actively seek out missions to complete after transmigrating. We call them transmigrators.