A girl who's always half-asleep turns out to be carrying a generational curse, and the boy who falls for her has to watch her fulfill it. The movie doesn't sentimentalize the sadness, it lets you sit in the specific, quiet ache of loving someone whose purpose might erase them. By the time you understand what the "butterfly" means, you've already accepted that some people are born to disappear, and that doesn't make them love you any less.
Hairi arrives on a quiet island for summer and meets Ao, a perpetually drowsy girl whose family guards an unusual secret. As their bond deepens, he notices she vanishes each night to fulfill a mysterious obligation passed through her family line. When Hairi insists on understanding what drives her away, he discovers the truth behind the Sorakado legacy: Ao's connection to ethereal butterflies that bridge the living and something beyond. What begins as a simple summer romance transforms into something more profound. Hairi watches Ao navigate the weight of inherited duty while grappling with what it means to live for others. The island's languid atmosphere masks genuine supernatural strangeness, and the butterflies become the key to understanding Ao's sleepy melancholy. This is a story about accepting responsibility, love that transcends explanation, and finding beauty in the bittersweet. The narrative balances slice-of-life warmth with moments of genuine mystery, creating space for quiet reflection alongside romantic tension. It speaks to anyone who has felt the pull between personal desire and inherited obligation.