“I’m all you need right, Nii-san?”

My parents remarried and I got a step-sister two years younger than me.
However, my step-sister became a shut-in after being bullied in middle school.

In order to get my shut-in step-sister to open up to me, I, as her older brother, made a lot of attempts and as a result, I was able to get her to let me into her room…….

“―I, have become unable to live without Nii-san♡”

As a result of comforting and continuing to act as her big brother,
Before I knew it, I found myself facing advances from my affectionate and sometimes aggressive step sister every day.

※ It may take some time for the yandere tendencies to fully develop. Enjoy the anticipation while reading through the beginning stages.

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