Set during the Meiji Restoration period of Edo era Japan, Naoyuki belongs to the 8th generation of the Inoyama family, a wealthy family known for finance & accounting. He is also a gifted mathematician and uses the abacus with extreme skills. Naoyuki works under the declining Kaga domain. Because of this, Naoyuki and his wife Koma suffer hardships as their stature and wealth dissipates.
| Actor | Role |
|---|---|
 Masato SakaiNaoyuki Inoshiyama | Naoyuki Inoshiyama |
 Yukie NakamaKoma Inoshiyama | Koma Inoshiyama |
 Keiko MatsuzakaTsune Inoshiyama | Tsune Inoshiyama |
 Masahiko NishimuraYosohachi Nishihisashi | Yosohachi Nishihisashi |
 Mitsuko KusabueObabasama | Obabasama |
 Yuki ItoShigeyuki Inoshiyama | Shigeyuki Inoshiyama |
 Mina FujiiSei Inoshiyama | Sei Inoshiyama |
 Kaito OyagiNaokichi Inoshiyama | Naokichi Inoshiyama |
 Masatoshi NakamuraNobuyuki Inoshiyama | Nobuyuki Inoshiyama |
| YYura ArataMasa Takenaka | Masa Takenaka |
 Kyusaku ShimadaNot listed | Not listed |
 Ichirôta MiyakawaNot listed | Not listed |
 Shigemitsu OgiNot listed | Not listed |
 Yozaburo ItoNot listed | Not listed |
 Yoshida AsahiNot listed | Not listed |
| KKoji SatoNot listed | Not listed |