Waaah, this is so hard! I'll take a shot though:
1. Ai Araba It's Alright
2. Furusato
3. Mikan
4. Shabondama
5. Toki wo Koe Sora wo Koe
6. Hare Ame Nochi Suki
7. Kanashimi Twilight
8. Wagamama Ki no Mama Ai no Joke
9. Ai no Sono ~Touch My Heart!~
10. Tsumetai Kaze no Kataomoi
11. One Two Three
12. Ame no Furenai Hoshi dewa Aisenai Darou?
13. Ai no Tane
14. Genki+
15. Koi no Dance Site
16. SEXY BOY ~Soyokaze ni Yorisotte~
17. AS FOR ONE DAY
18. Mukidashi de Mukiatte
19. Motto
20. Egao no Kimi wa Taiyou sa
My list will change tomorrow.