NTR Sister Chika 100% save file full save all routes/scenes/endings unlocked

Chika and Kazuki have lived together peacefully since losing their mother at a young age. Because their father frequently relocates for work, the two have learned to rely on each other while growing up. Although Chika cares deeply for Kazuki, she has always struggled to express her feelings and often acts cold or teasing toward him. One afternoon, she sees Kazuki being approached by a female classmate who confesses her feelings to him. Although Kazuki turns her down, the incident makes Chika realize that she could eventually lose him to another girl. Determined to make her feelings known, Chika finally confesses to Kazuki and tries to change their relationship. However, Kazuki remains hesitant about taking the next step, and this uncertainty leaves Chika vulnerable to attention from other men. As other characters become involved, Chika's relationship with Kazuki is increasingly tested. The story follows their emotional struggle and asks whether the two can overcome their hesitation and become a couple, or whether outside influences will permanently change their relationship.