Koi no hitsuyou-juubun jouken (necessary and sufficient conditions of love)

Mihoshi:
Zutto matte ita no
Konna hi o
Itoshii ano hito to
Hajimete no christmas

Te zukuri no kekki ga
Puresento na no
Aijyou kome nagara
Yaite iru no yo

Washu:
Sonna koto shite mo
Arigatasa o
Ninshiki saseru no wa
Muzukashii no yo

Ichinichi no karorii
Hyaku ni osaete
Kiga jyoutai ni surya
Kouka wa bai yo

Hitsuyou ga subete no michi o hiraku
It's a truth!
Kagakuteki taido de koisuru no yo

Mihoshi:
Teami no seetaa mo
Ageru no yo
Hantoshi mo maekara
Ande ita no yo

Washu:
Mainasu gojuu-do no
Reiki o okuri
Kaze o kojira sereba
Kouka wa bai yo

Hitsuyou ga ai no michi o hiraku wa
It's a truth!
Kagakuteki taido de kachi nuku no yo
Sore ga koi da wa

Mihoshi:
Kimochi no manma
Yurarete itai wa pukapuka
Moyamoya shiteru dake de
Suteki na no

Washu:
Hitsuzen o hito wa ai to nazuketa
It's a truth!

Mihoshi:
Muzumuzu shiteru dake de
Wakuwaku yo
Kitto koi yo ne

Washu:
Kagakuteki taido de koisuru no yo
It's a truth!

Mihoshi:
Funyafunya shitete
Tokechai sou da wa

Both:
I wish you a merry christmas
I wish you a merry christmas