The protagonist, Tsumugu, had an older stepsister, Tsumugu Nozomi, who loved him dearly.

Tsumugu thought that Nozomi couldn’t let go of the idea of him as a younger brother, but little did he know that Nozomi had a stronger brother complex than he imagined. Nozomi dreamed of a future where they could be happy together.

However, when faced with the barrier of being siblings, Nozomi felt she had to give up on her dream. Just as she was coming to terms with this, Tsumugu discovered that they were actually step-siblings.

In an attempt to avoid confusing Nozomi, Tsumugu tried to keep this revelation a secret, but it quickly became apparent. Nozomi, no longer willing to suppress her feelings, decided to release them all at once.

Burakon'na ane ga jitsuwa gishidatta to oredake ga shitte shimai, kakusou to shitaga sugu ni barete shimatte nēsan ga te ni oenaku natta kudan
My sister, who seems to have a brother complex, is actually my stepsister. I'm the only one who knows, and despite trying to keep it a secret, she quickly found out. Things became uncontrollable, and my sister couldn't handle it.
The Case Where I Found Out My Big Sister with a Brother Complex Was Actually My Stepsister, Tried to Hide It, but She Found Out Immediately and Became Uncontrollable
ブラコンな姉が実は義姉だったと俺だけが知ってしまい、隠そうとしたがすぐにバレてしまって姉さんが手に負えなくなった件

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