Since confessing their love on a rainy day, Aki and Sora Aoi, who are siblings, have been in a clandestine relationship. Little does Sora's twin sister Nami know about his affection for Aki when she plots to enroll him in the Fashion Research Club at school, hoping he will connect with Kana Sumiya, a fellow classmate. Unbeknownst to Nami, her actions conceal heart-wrenching realities. Though her intentions might seem like she's being a caring sister to help her brother find a girlfriend, she's hiding her own forbidden emotions.