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Boku no Suteki na Onee-chan
僕の素敵なお姉ちゃん
Kazuma is a young man who has always lived in the shadow of his beautiful and popular older sister. She is perfect in every way, and he can't help but feel inferior to her. His feelings of inadequacy turn into a dangerous obsession as he begins to see her in a new, forbidden light. What starts as sibling rivalry becomes something much more twisted and intimate.
As Kazuma's obsession grows, he devises a plan to get closer to his sister and make her see him as more than just a little brother. He will stop at nothing to possess her, even if it means crossing lines that should never be crossed. The story follows his descent into a world of taboo desires and the consequences that follow.