10 Days with My Bratty Stepsister

About this game

A ten-day visit forces you to share a tiny apartment with Nanaka, the stepsister you have not seen in years. She was once warm and attached to you, but the girl who arrives is guarded, sarcastic, and quick to push you away. With nowhere to escape the tension, you must decide how to respond to her changing moods and uncover the reason behind her hostile behavior. Developed by Punkif, 10 Days with My Bratty Stepsister is a Completed, choice-based visual novel built around a strict daily countdown. Conversations and decisions influence Nanaka’s reactions, gradually redirecting the course of this complicated step-sibling reunion. The confined setting keeps the focus on the pair’s evolving relationship, while branching scenes make each choice capable of changing how their ten days together unfold. The game presents its story through 2dcg artwork and includes mosaic-censored adult visuals. Version 1.0.0 is available for Windows, with interface and story text in English, Japanese, Korean, and Simplified Chinese. All voiced dialogue is performed in Japanese. Also released under the title なまいき義妹とヒミツの10日間, it offers a finished storyline whose outcome depends on the path you take with Nanaka.