Natsu no Hi to Kimi no Koe

 is the ninth single released by ChouCho.

Single Information
The lead track, Natsu no Hi to Kimi no Koe, was used as the opening theme for the anime Glasslip, while Lucent Eyes was used as an insert song.
 * All Lyrics: ChouCho
 * Composition: Watanabe Takuya (Track 1), Yatoki Tsukasa (Track 2)
 * Arrangement: Watanabe Takuya (Track 1), Yatoki Tsukasa (Track 2)
 * Strings Arrangement: Ishikawa Tomohisa (Track 2)

Tracklist

 * 1) Natsu no Hi to Kimi no Koe (夏の日と君の声)
 * 2) Lucent Eyes (ルーセントアイズ)
 * 3) Natsu no Hi to Kimi no Koe (夏の日と君の声) (off vocal)
 * 4) Lucent Eyes (ルーセントアイズ) (off vocal)