When your precious notebook goes missing, you ask the Otogi Bank for help in searching for it.

Nanase Watanabe does not belong in a club. She belongs in a quiet secluded area where she can be her usual cold, socially-awkward, child prodigy self. But all that changes when she is accepted into Otogi Academy and thrown right into the arms of the Otogi Bank. Because apparently, cold, socially-awkward child prodigies can be of use to the corrupt. ... And the outcome isnt pretty.