Cale Henituse's Younger Sister?

Cale Henituse become a regressor at the age of 40 years old to a 10 years old child. However, turned out that he has a younger sister which he does not have before in the first live.

But...this younger sister is an oblivious sacrifical bastard that he needed to protect especially from 'heroes' and even the enemy?
It feels like the main purpose has changed from protecting the world to protecting his sister...

How do they gonna survive then..

Read for further~

*I do not own any arts and characters (totcf)
*this is only fanfiction
*cover edited by me but the illustrations are belong to the rightful owner

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