Postscript: Romaji by mink; color-coding by AquaChan; translation by hamuretto.

WE WELCOME THIS HAPPINESS! TONIGHT
秋風の中で
WE WELCOME THIS HAPPINESS! TONIGHT
永遠を誓うメロディ

１０月の出会いは　長く幸せになると
本で　見たの　昔
DO IT DO IT

英会話じだいは　上手にならなかった
だけど　あなたに出会えた

HEY DARLING
このまま　信じて　行くわ（ウ～ン）
あなたは　そのまま　自由で（アハ～ン）
愛も　夢も　恋も　華も
ねえ　全部　freedom

WE WELCOME THIS HAPPINESS! TONIGHT
秋風の中で
WE WELCOME THIS HAPPINESS! TONIGHT
永遠を誓うメロディ

WE WELCOME THIS HAPPINESS! TONIGHT
満月の光で
WE WELCOME THIS HAPPINESS! TONIGHT
永遠を誓うメロディ

[Fu/Kas/Ok] WE WELCOME THIS HAPPINESS! TONIGHT
Akikaze no naka de
[No/Oo/Ha] WE WELCOME THIS HAPPINESS! TONIGHT
Eien wo chikau MERODI

Juugatsu no deai wa nagaku shiawase ni naru to
Hon de mita no mukashi
[Fu/Kas/Ok] DO IT DO IT

Eikaiwa jidai wa jouzu ni naranakatta
Dakedo anata ni deaeta

[No/Oo/Ha] HEY DARLING
[Kas/Ni] Kono mama shinjite yuku wa (U~N)
[Oo/Ok] Anata wa sono mama jiyuu de (AHA~N)
Ai mo yume mo koi mo hana mo 
Nee zenbu freedom 

[Fu/Kam/Kas/Ok] WE WELCOME THIS HAPPINESS! TONIGHT
Akikaze no naka de 
[No/Oo/Ha/Ni] WE WELCOME THIS HAPPINESS! TONIGHT
Eien wo chikau MERODI

[Fu/Kam/Kas/Ok] WE WELCOME THIS HAPPINESS! TONIGHT
Mangetsu no hikari de
[No/Oo/Ha/Ni] WE WELCOME THIS HAPPINESS! TONIGHT
Eien wo chikau MERODI

WE WELCOME THIS HAPPINESS TONIGHT
Amidst the autumn breeze
WE WELCOME THIS HAPPINESS TONIGHT
A melody that vows to eternity

Long ago, I saw a book that said 
October meetings bring great happiness
DO IT DO IT

I'm not skilled at this English Language School era
But at least I met you

HEY DARLING
No matter when you go on believing
As it is, you're free
Affection and dreams and romance and flowers
Hey, they're all forms of freedom

WE WELCOME THIS HAPPINESS TONIGHT
Amidst the autumn breeze
WE WELCOME THIS HAPPINESS TONIGHT
A melody that vows to eternity

WE WELCOME THIS HAPPINESS TONIGHT
The light of the full moon
WE WELCOME THIS HAPPINESS TONIGHT
A melody that vows to eternity