Please, I Really Didn’t Know My Junior Sister Was a Yandere

Su Ran transmigrated to a cultivation world and became the senior disciple of the world’s top sword sect. Along with Su Ran came a system, but this system was a bit unusual. Su Ran, full of confidence, believed that becoming a Sword Immortal was only a matter of time. One day, the system issued a mission: [Ding! Confess your love to your junior sister, and you will receive a life-bound flying sword] Su Ran happily accepted the mission, thinking it was an easy win. Confessing his feelings to his childhood friend and junior sister? How could that be anything but simple? But after successfully confessing, Su Ran realized something was wrong. It seemed his junior sister was what the legen...