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Album title
- "相愛性理論"
- Romaji: Sou Ai Sei Ri Ron
- English: The Theory of Loving Each Other
Published April 21, 2010, for ¥3,000
Featuring
Producers
- DECO*27 (producer)
- kous, sasakure.UK, Treow (arrange)
- Ryo Umemura (mastering)
- Ryono (album art)
Affiliation
- SPACE SHOWER MUSIC, Third-Ear(JOINT RECORDS), U/M/A/A
Background[]
"Souaisei Riron" is DECO*27's fifth album. It features only Hatsune Miku, with Topi featured in the chorus for track 13 and as the main vocalist for track 15.
Preceding and succeeding albums[]
Love Gazer
Track listing[]
All tracks written by DECO*27, with arrangements by kous for track 16, sasakure.UK for track 17, and Treow for track 18.
| No. | Title | Length |
|---|---|---|
| 1. | "相愛性理論 (Sou Ai Sei Ri Ron)" (The Theory of Loving Each Other) | 4:27 |
| 2. | "ハルイチ。 (Haru Ichi.)" (The First Winds of Spring Begin to Blow.) | 2:55 |
| 3. | "愛+K=aKi (Ai + K=aKi)" | 3:05 |
| 4. | "心壊サミット (Shinkai Summit)" (HeartBEAT Summit) | 2:48 |
| 5. | "愛言葉 (Ai Kotoba)" (Love Password) | 4:24 |
| 6. | "恋様シート (Koisama Sheet)" (Love Like a Sheet) | 3:32 |
| 7. | "僕みたいな君 君みたいな僕 (Boku Mitai na Kimi, Kimi Mitai na Boku)" (You're Kinda Like Me, I'm Kinda Like You) | 4:27 |
| 8. | "キミ以上、ボク未満。 (Kimi Ijou, Boku Miman.)" (Better Than You, Worse Than Me) | 3:43 |
| 9. | "好きよ好きよも好きのうち (Suki yo Suki yo mo Suki no Uchi)" | 3:15 |
| 10. | "罪と罰 (Tsumi to Batsu)" (Crime and Punishment) | 3:01 |
| 11. | ""bye-bye" by my 愛 ("bye-bye" by my Ai)" ("bye-bye" by my Love) | 3:35 |
| 12. | "愛 think so, (Ai think so,)" (Love (I) think so,) | 3:59 |
| 13. | "二息歩行 (Nisoku Hokou)" (Two Breaths Walking) | 3:03 |
| 14. | "一人ぼっちで二人きり (Hitoribocchi de Futarikiri)" (Just Us Two, Alone) | 3:26 |
| 15. | "愛 think so, (Ai think so,)" (Love (I) think so,) | 4:00 |
| 16. | "ハルイチ。 (Haru Ichi.) (kous Remix)" (The First Winds of Spring Begin to Blow.) | 3:10 |
| 17. | "愛言葉 (Ai Kotoba) (sasakure.UK Remix)" (Love Password (sasakure.UK Remix)) | 4:24 |
| 18. | "相愛性理論 (Sou Ai Sei Ri Ron) (Treow Remix)" (The Theory of Loving Each Other (Treow Remix)) | 4:42 |
| Total length: | 1:05:56 | |
Promotional goods[]
Included with the album is a DVD featuring PVs for the following songs:
- "Sou Ai Sei Ri Ron"
- "Nisoku Hokou"
- "Ai, think so,"
- "No You, No Me"
First press editions include a 32-page booklet and comes in a three-sided box with special glossy surface finish.