Yokoyama Rurika has announced that she will release her new single "Shunkan Diamond" on June 18.

The song was chosen as the ending theme for TV Tokyo's anime 'Tenkai Knights'. As the coupling tracks, the single will include a rock number called "One in a million" along with "Hajimete no Koi", which Yokoyama wrote the lyrics to. The single will be released in four different types: Limited Edition A, Limited Edition B, Limited Edition C, and Regular Edition.

CD:
01. Shunkan Diamond
02. One in a million
03. Hajimete no Koi
04. Shunkan Diamond (Instrumental)
05. One in a million (Instrumental)
06. Hajimete no Koi (Instrumental)

DVD (Limited Edition A):
?"Shunkan Diamond" Music Video

DVD (Limited Edition B):
?"Shunkan Diamond" Making

DVD (Limited Edition C):
?Rurika no Kyujitsu (tentative)