The Morisawa couple run a small-to-medium-sized design office in a certain city in the Kanto region. Kana, the wife, works as an office worker, doing desk work in accounting and general affairs every day. The middle-aged president of Nakata Kogyo, which runs a large business in the same city, is an important client of the Morisawa Tax Accounting Office. One day, the office receives an angry phone call from Nakata Kogyo with a complaint. Unfortunately, the husband is unable to go on business, so Kana, the office worker, visits the office with a box of sweets to apologize, but then...!