| Eien / Universe / Believe in Love | |
| Cover: | Boa-eienCD.jpg |
| Type: | single |
| Artist: | BoA |
| Album: | Best & USA |
| Released: | February 18, 2009 |
| Recorded: | 2009 |
| Genre: | |
| Label: | Avex Trax |
| Producer: |
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| Prev Title: | Eat You Up |
| Prev Year: | 2008 |
| Next Title: | I Did It For Love |
| Next Year: | 2009 |
is BoA's twenty-seventh Japanese single. It was released on February 18, 2009 in two formats, CD-only and CD+DVD. The CD edition also comes in a first press limited edition. Following "Eien", the second A-side, "Universe", features fellow J-pop singer Crystal Kay and label mate, Verbal of M-Flo. The third A-side is the acoustic version of Ravex's single "Believe in Love", which features BoA.[1] The 4th track on the Limited Edition version of the single, Best Hit Mega Blend [Limited Edition Bonus Track], is a mashup of multiple of her best hits in Japan.
Oricon Sales Chart (Japan)
| Chart | Peak Position | Sales Total | Chart Run | |
|---|---|---|---|---|
| Oricon Daily Singles Chart | 5 | |||
| Oricon Weekly Singles Chart | 8 | 22,354 | 5 weeks |