Himitsu no Kankei -Nagisa to Sakura-

In "Secret Relations -Nagisa and Sakura-", Sakura is the lively center of her class, yet she's also your devoted sex slave. This adventure game uncovers the clandestine after-school affair between Sakura and her old buddy and current sex friend Nagisa, who possesses a uniquely special body. How their secret relationship ends is entirely up to you.