A love story involving two adult women. Seina, a novelist, harbors feelings akin to romantic love for her older sister, Yuna. Unable to endure the "sense of loss" caused by her sister's departure, Seina finds herself unable to write. She can't even respond to messages from Yuna. Kiku, Yuna's close friend and former lover, persistently comes to check on Seina, who is struggling to maintain a normal life. Despite her discomfort with Kiku, Seina finds herself swept along by her attentions. Yet, Kiku also has feelings for Seina that she grapples with――. A love story involving two adult women.