姉の親友、私の恋人。 3

[DeepL Translation - needs review] Volume 1 Introduction: Seina, a novelist, has been harboring something like romantic feelings for her own sister, Yuna. Unable to bear the "sense of loss" caused by her sister's separation, Seina became unable to write her novels, She was unable to respond to messages from her sister. She is unable to even lead a normal life, when her sister's best friend and "her sister's ex-lover," Kiku, comes to visit her and pester her. Although Sena thinks she is not v...