未来の扉/Mirai no Tobira

From Morning Musume's Album "First Time".
Released: 1998.
Members:
1st Gen
Nakazawa Yuko (leader)
Ishiguro Aya
Iida Kaori
Abe Natsumi
Fukuda Asuka
2nd Gen
Yasuda Kei
Yaguchi Mari
Ichii Sayaka