"A senior, the Nanako that work is possible" and "a younger student, the Rui which are a scatter-brain." Such two people will keep company at ardent approach of the Rui in the form that Nanako lost recently. But the Nanako made a promise "to never expose relations to a company and a husband" as a condition to go together. On such one day, the Rui flown into a rage with Nanako was distracted by a mistake of the work, and broke a promise with the Nanako, and have violated Tabuu in the workplace….
