Plot:
High school girl Tachibana Seto Ka (Tsuchiya Taiho) is doted on by her brother Haruka (Katayoshi Ryota). Haruka is shaken by the knowledge that he has no blood relationship with his sister, and decides to keep the secret deep in his heart and stay by his sister's side. However, Seto Ka meets her first love Serikawa Takamine (Chiba Yudai) again, and their relationship quickly heats up.