Saving Them? Isn't That a Lifetime of Regret?!

To save her terminally ill little sister, Amano Yume became the plaything of several obsessive women.

The aloof witch who freezes everything is actually a tsundere, and the ruthless ruler of the Eastern Kingdom is actually a social recluse...

Her mission is to save them, then leave their world and return to her little sister.

But every time she completed a mission, she would leave them with a smile and disappear, leaving them to regret it for the rest of their lives.

Then they came running out of the books, found her in the real world, and demanded an explanation.

The first was her sworn little sister from another world: Amano Yuki.

“Hey... You fake mage. Do you regret saving that little girl back then, just because your compassion got the better of you?”

“...Can we keep it from my little sister that the people in her fairy-tale books came to life and are doing unspeakable things with her big sister?”

“...That depends on how you behave, Big Sister Mayusha~”