One Planet for Everyone! Building Science and Technology Civilization at the Beginning - Chapter 298: Mission Impossible! The last bottom card!

Read the first chapter. You will probably like it. ;)

A tree of 10,000 flowers, the world is the door.
The spells change a lot, but the hearts of the people are unchanged.

- Description from Uukanshu translation

My old man pointed to the flower-like woman and said, "Call her mother from now on." He then pointed to a flower-bud-like girl and said, "This is your little sister."

5 years after the world changed, the final boss appeared.