『What bound the sisters together was a bittersweet kiss.』

I, Tachibana Mako, have a twin sister named Tachibana Koma. Unlike me, who can't do anything right, she's my pride and joy of a younger sister—incredibly talented, kind, cute, beautiful, and devoted to her older sister. However... my sister has just one problem, one I could never tell anyone else about...

And so begins a slightly silly love (?) yuri comedy, brought to you by a hyper sister-complex older sister and her beloved younger sister!