The story follows Kai (played by Takuma Usa), a kind-hearted but clumsy man who struggles to get anything right. Burdened with debt, he is kicked out of his home one day. He receives a call from his twin brother Riku, who is abroad on a business trip. Riku offers him a deal: "You can stay at my place, and I'll even pay off all your debts. But in return…"

When Kai enters his brother's house, a mysterious man named Chiaki (played by Ryutaro Imai) suddenly barges in, hugs him, and kisses him. It turns out that Chiaki is Riku's lover. Riku then asks Kai to pretend to be him and break up with Chiaki to pay off his debts. Thus begins a tumultuous mistaken identity room-share story.