The Little Sister I Picked Up Is a Bit Yandere?!

In the year 20xx, an ancient virus reemerged, and within months, infection had spread across the entire globe! Order collapsed, morality crumbled, and humanity's survivors lived on borrowed time. The apocalypse had arrived.

Lan Ke, a history student born in the era of reconstruction after the apocalypse, accidentally transmigrates to the very beginning of the end times. To bring the apocalypse to an end sooner, she decides to defy fate, find Eva, the key figure who can end it, and set history back on course. However...

"Big Sis, Big Sis! It's dangerous, don't go!" the twelve-year-old cutie whines and clings to her.

Lan Ke: Ah, she's so cute!!! My heart is melting~

"Lan Ke! If you dare take one step outside the base, don't ever expect to see me again!" The sixteen-year-old hothead shouts at her, eyes red-rimmed.

Lan Ke: Is this what they call a rebellious phase???

"A-Ke, do you really like that woman so much? Am I really just a little sister to you?" At eighteen, the girl has blossomed into an unrivaled beauty, but a sorrow lingers in her eyes, one Lan Ke cannot understand.

Lan Ke: What do I do??!! The little sister I raised has fallen for me?? And she wants to break up me and my girlfriend?!

Raising kids during the apocalypse is no easy task. They pout and throw tantrums, and you just have to take it! But this little sister she picked up seems rather unusual...

* One-on-one romance, happy ending, read without worry

* A seemingly flirtatious but actually devoted top x a tsundere, scheming, absurdly powerful, slightly yandere bottom

* Not-really-incest trope

* Apocalyptic zombies and supernatural abilities

Theme: Surviving the apocalypse, deep sisterly love