Kirari, a serious and quiet girl, had been harboring feelings for her older brother that went beyond the normal sibling bond for some time. She couldn't confide in anyone about her feelings, and she spent her days in her room, soothing her desires and calming the heat in her body with her fantasies. However, one day, Kirari could no longer suppress her emotions, leading her to take an unexpected action. The hidden longing behind her glasses began to spiral out of control...