The first time that up-and-coming architect Yuji Muraoka (Yujiro Ishihara) met Natsuko (Ruriko Asaoka) was at a contemporary art exhibition at the Ueno Museum of Art. At the time, he didn't feel anything special about her, other than being impressed that she was the younger sister of the respected Nonomura-san. Later, at Nonomura's birthday party, some people who were jealous of Yuji's talent tried to embarrass him by forcing him to perform a hidden talent show, and Natsuko quickly came to his rescue. This incident caused the two of them to become much closer...
| Actor | Role |
|---|---|
 Yūjirō IshiharaYuji Muraoka | Yuji Muraoka |
 Ruriko AsaokaNatsuko Nonomura | Natsuko Nonomura |
 Ryōji HayamaKinya Nonomura | Kinya Nonomura |
 Yōko MachidaKaoru Nonomura | Kaoru Nonomura |
 Hideaki NitaniMinoru Muraoka | Minoru Muraoka |
| MMasao ShimizuSogo Muraoka | Sogo Muraoka |
| YYumi TakanoJunko Muraoka | Junko Muraoka |
 Hisako TakihanaNobuko Muraoka | Nobuko Muraoka |
 Tomoko NaraokaSachiko Muraoka | Sachiko Muraoka |
 Tomo'o NagaiIchiro Muraoka | Ichiro Muraoka |
 Masami ShimojōProf. Kitazawa | Prof. Kitazawa |
 Yukihiko SugiHasegawa | Hasegawa |
| SShonosuke SawamuraNot listed | Not listed |
 Shōki FukaeNot listed | Not listed |
| TTakashi SudoHayakawa | Hayakawa |