I didn't think about these long and hard, just wondered if I should pick "I WISH", but then I was like "pfft, Nacchi doesn't even have lines in it", so...
01 - Morning Coffee
02 - Summer Night Town
03 - Daite HOLD ON ME!
04 - Memory Seishun no Hikari05 - Manatsu no Kousen06 - Furusato
07 - LOVE Machine
08 - Koi no Dance Site - not really the greatest song imo, but PV & roster rocked, + personal nostalgy
09 - Happy Summer Wedding
10 - I WISH
11 - Renai Revolution 2112 - The Peace!
13 - Mr. Moonlight ~Ai no Big Band~
14 - Souda! We're ALIVE
1
5 - Do it! Now16 - Koko ni Iruzee!
17 - Morning Musume no Hyokkori Hyoutan-jima
18 - AS FOR ONE DAY19 - Shabondama20 - Go Girl ~Koi no Victory~
21 - Ai Araba IT'S ALL RIGHT
22 - Roman ~MY DEAR BOY~23 - Joshi Kashimashi Monogatari
24 - Namida ga Tomaranai Houkago
25 - THE Manpower!!!
26 - Osaka Koi no Uta27 - Iroppoi Jirettai28 - Chokkan 2 ~Nogashita Sakana wa Ookiizo!~
29 - SEXY BOY ~Soyokaze ni Yorisotte~
30 - Ambitious! Yashinteki de ii Jan