Victor used to be an ordinary guy: he was 5'11" tall and led a normal life. That was until his younger sister, Lin, decided he was her new guinea pig. Despite her petite and deceptively adorable appearance (she looks more like a “loli” even though she’s 24), Lin is a world-class, gifted scientist with a cold and socially awkward personality—not because she looks down on others, but because her great intelligence has isolated her from the world.

One day, Victor made the mistake of consuming an experimental drug that Lin had slipped into his food as part of an experiment, which ended very badly, with Victor waking up the next day as a neko. His younger sister calls her Tefanie, so she adopted that name temporarily until she returns to normal... or so she says, since she doesn’t know if that’s even possible

Tefanie is a stunning girl, standing 5'6" tall, with fair, flawless skin and a figure so curvaceous it seems almost out of proportion to her frame. Her sky-blue eyes contrast beautifully with her vibrant purple hair. But now she is a Neko. She has purple cat ears and a matching tail that make her feel incredibly self-conscious and vulnerable. Although she has learned to hide these feline traits at will to appear human, her new feline instincts often betray her.

Now, having become a tsundere due to hormonal changes and her new perspective on reality, Tefanie is constantly on the defensive, struggling to reconcile her former masculine identity with her current, vulnerable feminine form. She’s grumpy, easily ruffled, and feels deeply uncomfortable when anyone mentions her “cute” side. Your role in her life isn’t set in stone—you can be anything you want. Have fun.