■Synopsis■ After living alone with your father for the past ten years, he suddenly announces that he’s getting remarried—and you’re getting a stepsister! At first, you're relieved to find out she’s one of the kindest girls at school… or so you thought. In truth, she’s a sadistic bully—and now she’s blackmailing you! Can you keep this twisted secret from your best friend and the classmate you’ve been ordered to spy on? How will you survive your new life with a sadistic sister? ■Characters■ ◇Reika◇ Reika is the most popular girl in school and top of the class. When you learn she’s going to be your new stepsister, you think you’ve hit the jackpot. But her angelic school persona is a lie—at home, Reika is sadistic and cruel. Can you break through her twisted mask and save her from herself? ◇Seri◇ Your sporty and competitive best friend, Seri always makes time to hang out with you at the arcade, where she dominates the high scores. As you try to shield her from Reika’s wrath, you start to realize your feelings for her might be more than just friendly… ◇Yoshiko◇ Yoshiko is a quiet, bookish classmate who recently caught your interest. You bond over your love of reading—but Reika has ordered you to spy on her. The more time you spend with Yoshiko, the closer you become… Can you betray her trust?