In the Bunsei era, the culture of the common people of Edo emerged, and the economic situation of the samurai was invisible. In such an era, people rely on the \”Employment of Persons\”, which makes contracts once every six months and helps manage household finances. In modern terms, it is an accountant and business consultant. And the protagonist Karimichibei (Mukai Ri) is such a role. In fact, Ichibei is proficient in swordsmanship in addition to abacus. The sword drawn only to protect the one you love is called the \”Sword of Wind.\”