"Friend"/"Sugao no mama" (Friend/素顔のまま; lit. "Friend/The Way I Am") is a single by Japanese singer-songwriter Rina Aiuchi. It was released on 17 December 2008 through Giza Studio, as the second single from her seventh studio album Thanx. The double A-side single reached number eight in Japan and has sold over 12,383 copies nationwide.[1] "Friend" served as the theme song for the Japanese television show Ongaku Senshi ~Music Fighter~. 
  Track listing
 CD single (Limited edition)| Title | Writer(s) | Arranger(s) | 
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| 1. | "Friend" |  | Kenji Arai | 5:23 | 
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| 2. | "Sugao no mama" |  | Ozawa | 4:59 | 
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| 3. | "Friend" (Instrumental) |  | Arai | 5:25 | 
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| 4. | "Sugao no mama" (Instrumental) |  | Ozawa | 4:55 | 
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Limited edition bonus DVD| Title | Writer(s) | 
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| 1. | "Friend" (Music Clip Special Edition) |  |  | 
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CD single (Standard edition A)| Title | Writer(s) | Arranger(s) | 
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| 3. | "Today Is the Day" | Double SOsamu IwasakiYuichi Komori
 | Komori | 3:32 | 
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| 4. | "Friend" (Instrumental) |  | Arai | 5:25 | 
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| 5. | "Sugao no mama" (Instrumental) |  | Ozawa | 4:55 | 
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CD single (Standard edition B)| Title | Writer(s) | Arranger(s) | 
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| 3. | "Negai ga Kanaunara" |  | Takeshi Hayama | 5:01 | 
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| 4. | "Friend" (Instrumental) |  | Arai | 5:25 | 
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| 5. | "Sugao no mama" (Instrumental) |  | Ozawa | 4:55 | 
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Digital download| Title | Writer(s) | Arranger(s) | 
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| 1. | "Friend" |  | Kenji Arai | 5:23 | 
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| 2. | "Sugao no mama" |  | Ozawa | 4:58 | 
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| 3. | "Negai ga Kanaunara" |  | Takeshi Hayama | 5:01 | 
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Charts
  Certification and sales
  Release history
  References
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| Studio albums |  | 
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| Compilation albums |  | 
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| Singles |  | 
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| Related articles |  | 
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| Authority control databases |  | 
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