Sou Ai Sei Ri Ron (相愛性理論 The Theory of Loving Each Other) is DECO*27's fourth album. It features only Hatsune Miku.

Sou Ai Sei Ri Ron
Released April 21, 2010
Producer DECO*27
Price ¥3,000
Illust. Ryouno
Track list
1. 相愛性理論
Sou Ai Sei Ri Ron / The Theory of Loving Each Other
Hatsune Miku
2. ハルイチ。
Hatsune Miku
3. 愛+K=aKi
Hatsune Miku
4. 心壊サミット
Heart Break/BEAT Summit
Hatsune Miku
5. 愛言葉
Ai Kotoba / Love Words
Hatsune Miku
6. 恋様シート
Koi-sama Shīto / Love Like A Sheet
Hatsune Miku
7. 僕みたいな君、君みたいな僕。
Boku Mitaina Kimi, Kimi Mitaina Boku. / I Like You, You Like Me
Hatsune Miku
8. キミ以上、ボク未満。
Kimi Ijō, Boku-Miman. / More Than You, More Than Me.
Hatsune Miku
9. 好きよ好きよも好きのうち
Suki yo Suki Yomo Suki no Uchi
Hatsune Miku
10. 罪と罰
Tsumi to Batsu / Crime and Punishment
Hatsune miku
11. "bye-bye" by my 愛
"bye-bye" by my Ai / "bye-bye" by my Love
Hatsune Miku
12. 愛 think so,
Ai think so,
Hatsune Miku
13. 二息歩行
Nisoku Hokou / Two Breaths Walking
Hatsune Miku (with Topi)
14. 一人ぼっちで二人きり
Hitoribotchi de Futarikiri / Alone By Myself
Hatsune Miku
15. 愛 think so,
Ai think so,
16. ハルイチ。 (kous Remix)
Haruichi. (kous remix)
kous feat. Hatsune Miku
17. 愛言葉 (sasakure.UK Remix)
Ai Kotoba / Love Words (sasakure.UK Remix)
sasakure.UK feat. Hatsune Miku
18. 相愛性理論 (Treow Remix)
Sou Ai Sei Ri Ron / The Theory of Loving Each Other (Treow Remix)
Treow feat. Hatsune Miku
Love Gazer
Parallel World

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