National Audit Bureau member Matsudaira Hajime (Tsutsumi Shinichi), Torii Tadako (Ayase Haruka) & Asahi (Okada Masaki) travel from their homebase of Tokyo to the city of Osaka. Their mission is to discover any financial irregularities & to ensure the correct use of federal money in the Osaka city government. Their initial audits go smoothly, but things turn more interesting once they enter the Karahori shopping district - the area with a long history reaching back to the Meiji era.
The trio of auditors encounter Sanada Koichi (Nakai Kiichi), who runs a tasty okonomiyaki (Japanese pancakes) restaurant and his son Daisuke (Morinaga Yuki), who wants to be a girl. There's also Daisuke's best friend Hashiba Chako (Sawaki Ruka), a tomboyish girl who protects Daisuke at school from bullying. The auditors then inspect the H.R.H. Foundation, an organization set out to preserve Osaka's historical castles. Although their initial inspection doesn't turn out anything suspicious, it will a short while later. After the trio leave the H.R.H. Foundation and head for Koichi Sanada's restaurant for lunch. When they arrive, Matsudaira Hajime realizes that he left his cellphone at the H.R.H. Foundation. When Hajime returns to the H.R.H. Foundation he discovers that the office is now completely empty (when before it was full of workers), the phones in the office are not connected & the desk drawers are empty!
A full blown investigation is initiated by Matsudaira Hajime and they soon make a startling realization that the whole city of Osaka is running a coverup. A 400 year old secret held by the city of Osaka is about to be revealed...