| Chikai | |
| Cover: | Chikai.jpg |
| Type: | single |
| Artist: | Eiko Shimamiya |
| B-Side: | OXISOLS |
| Released: | April 8, 2009 |
| Genre: | J-Pop |
| Length: | 19:44 |
| Label: | Frontier Works |
| Producer: | I've Sound |
| Prev Title: | Wheel of Fortune |
| Prev Year: | 2007 |
| Next Title: | Super Scription of Data |
| Next Year: | 2009 |
is Eiko Shimamiya's fourth single produced by I've Sound and Geneon Entertainment label. It is set to be released on April 8, 2009, a year after releasing her third single "Wheel of Fortune". The title track is used as the opening theme for, the live-action film sequel for the first Higurashi no Naku Koro ni live-action film.
The single's catalog number is FCCJ-0003 for the regular CD-only edition since it won't be having a limited CD+DVD edition. Overall, this will be Shimamiya's fourth tie-in with the Higurashi no Naku Koro ni series.
Composition: Tomoyuki Nakazawa
Arrangement: Tomoyuki Nakazawa, Takeshi Ozaki
Lyrics: Eiko Shimamiya
Composition/Arrangement: SORMA No.1
Lyrics: Eiko Shimamiya
| Chart (2009) | Peak position | Total sales |
|---|---|---|
| Oricon Daily Chart | 19 | 3,582 |
| Oricon Weekly Chart | 39 |