| "Eien / Universe / Believe in Love" | 
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| Released | February 18, 2009 | 
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| Recorded | 2009 | 
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| Genre |  | 
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| Label | Avex Trax | 
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| "Love Song" (2006)
 | "Eien / Universe / Believe in Love" (2009)
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"Eien / Universe / Believe in Love" (永遠/Universe feat. Crystal Kay&Verbal(M-Flo)/Believe in LOVE feat. BoA) 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.
Track listing
Regular edition| Title | Lyrics | Music | 
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| 1. | "Eien (永遠, lit. Eternity)" | Narumi Yamamoto | Daisuke "D.I" Imai | 4:30 | 
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| 2. | "Universe" (feat. Crystal Kay & Verbal (M-Flo)) | Kumo, Verbal | Christian Karlsson, Pontus Winnberg, Henrik Jonback, So Shy, Magnus Wallbert, Balewa Mohammad, | 4:22 | 
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| 3. | "Believe in Love (Acoustic Version)  feat. BoA" | Emi K. Lynn | Ravex | 4:28 | 
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Limited edition| Title | 
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| 4. | "Best Hit Mega Blend" | 4:56 | 
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Regular edition| Title | 
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| 4. | "Eien (Instrumental)" |  | 
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| 5. | "Universe (Instrumental)" |  | 
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| 6. | "Introduction of Best & USA" |  | 
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DVD| Title | 
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| 1. | "Eien: Music Video" |  | 
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| 2. | "Introduction of Best & USA" |  | 
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Limited DVD| Title | 
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| 3. | "Best Mega Hits Blend: Visual Remix" |  | 
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- 04/06 - Music Station (Eien)
- 04/09 - NHK BShi (Eien) (with I Did It for Love, Meri Kuri)
- 04/29 - Gekkan Melodix! (Eien)
Charts
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 | 
Certifications
| Chart | Amount | 
| RIAJ full-length cellphone downloads [2] | Gold (100,000+) | 
References
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| Korean singles |  | 
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| Japanese singles |  | 
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| Japanese collaboration and digital singles
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| EPs |  | 
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| Singles |  | 
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| Related articles |  | 
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| Authority control databases |  | 
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