| radiance / Chi ni Kaeru: ～on the Earth～ | |
| Cover: | radiance.jpg |
| Caption: | Limited edition front cover |
| Type: | single |
| Artist: | Mami Kawada, Kotoko |
| Album: | Seed |
| Released: | February 23, 2005 |
| Genre: | J-pop |
| Length: | 24:27 |
| Label: | Geneon |
| Producer: | I've Sound |
is Mami Kawada's first single for a major label and Kotoko's third, produced by I've Sound. The songs were used as the opening and ending theme respectively for the anime series Starship Operators. Two versions of the single were released: a limited edition (GNCA-0014) and a regular edition (GNCA-0015). The limited edition included a DVD containing the promotional video for both songs. The single reached #19 on the Oricon charts and stayed for 9 weeks. It sold a total of 28,706 copies.