Twin sisters Mio and Hina share a single identity, "Sakuraba Sora," to keep their family's inheritance safe from a father looking for any legal opening to take it. It's worked for years.

Then Kazuki, an ordinary classmate, finds out by accident and gets pulled into keeping the secret. The problem isn't hiding two people. It's that he's starting to fall for both of them separately, for completely different reasons, and he has no idea what to do about it.

As the swap gets harder to maintain and the family pressure closes in, Kazuki has to figure out who he actually loves, not the idea of "Sora," but one specific sister, by name, before the secret and his own feelings both collapse at once.