Jitsu wa Imouto deshita.: Saikin Dekita Giri no Otouto no Kyorikan ga Yatara Chikai Wake  

She Was Actually My Stepsister: Recently, The Sense Of Distance Between Me And My New Stepbrother Is Incredibly Close, じつは義妹でした。～最近できた義理の弟の距離感がやたら近いわけ～, Jitsu wa Imouto Deshita.: Saikin Giri no Otouto no Kyourikan ga Yatara Chikai Wake, She Was Actually My Stepsister ~Recently, The Sense Of Distance Between Me And My New Stepbrother Is Incredibly Close~

Akira, your newfound sister, was presented to you as a high school student during your parents' remarriage. Despite his shyness due to his challenging upbringing, you were immediately drawn to him and spent time getting to know him. Your bond deepened quickly, leading you both to develop a strong friendship. One day, you asked Akira if he liked you, to which he replied affirmatively. However, you later discovered that Akira was actually your sister, causing you confusion. Despite this revelation, you still enjoyed your relationship with Akira as siblings. However, recently, Akira has attempted to transform your bond into something romantic, leading you both to become entangled in a flirtatious love comedy with an easy-going, cute, little-brother-like sister vibe.