Onii-chan Dakedo Ai Sae Areba Kankeinai yo ne

Following the tragic loss of their parents, Akito Himenokouji and his younger twin sister, Akiko, were separated and taken in by different adoptive families. Six years later, the siblings have finally been reunited, now living independently together under the same roof. However, their new domestic arrangement quickly proves to be anything but ordinary. Akiko harbors a deep and unabashed affection for her brother, making no effort whatsoever to conceal her intense attachment. Her devotion escalates into bold romantic overtures, including earnest attempts to persuade Akito to share an intimate first night together as they begin their shared life. Despite his sister’s relentless advances, Akito maintains a composed demeanor, consistently and calmly turning down her propositions. He firmly believes that pursuing a romantic relationship with his own blood relative is fundamentally impossible, choosing instead to uphold strict personal boundaries. Yet, Akiko remains entirely undeterred by his steadfast refusals. Driven by unwavering determination, she sets out to challenge his rigid convictions, intent on proving to him that genuine love possesses the power to transcend any obstacle—even the boundaries of family itself.