Well I found myself enjoying this song more than it should be healthy.

So I went in search for the lyrics, thought I should share the love for those who want to sing along ;) I'm not fluent in Japanese so I don't know how accurate this google translate transcription is. Enjoy!

Hitonami ni osa rete 
watashi kyō mo hitori 
imagoro ano ko wa 
nani o shi teru no ka na 

mo no samishī yoru wa 
ano ko o omoidasu 
atataka na nioi to 
fuwa ffuwa no egao 

mitsume atte futari (futari) 
o sara o narabetara 
itadakimasu 
gochisōsama 
shiawase tte ureshī ne 
o haraippai tabete (tabete) 
takusan waratta ne 
itadakimasu 
gochisōsama 
shiawase gurafiti 

o benkyō ni tsukarete 
futo hitotsu tameiki 
imagoro ano ko mo 
ganbatteru no ka na 

kon'nani samui hi wa 
ano ko o omoidasu 
oishi-sōna yuge to 
daisuki na egao 

onakagasuita toki wa (toki wa) 
o sara o narabeyou 
itadakimasu 
gochisōsama 
shiawase tte oishī ne 
futari de issho ni taberu (taberu) 
kokoro mo mitasareru 
itadakimasu 
gochisōsama 
shiawase gurafiti 

taberu tsukuru 
tsukuru taberu 
taberu tsukuru 
futari do~ubido~uba 
tsukuru tsukuru 
taberu taberu 
warau warau 
futari do~ubido~uba 

umaku ikanakute kuyashikute 
(shanrara shanrarara rara) 
tsurakutte nakitai toki mo 
(shanrara shanrarara rara) 
kimi ga soba ni irukara 
ganbaru nda, watashi 
sā, gohan no jikanda yo 

mitsume atte futari (futari) 
o sara o narabetara 
itadakimasu 
gochisōsama 
shiawase tte ureshī ne 
o hara ippai tabete (tabete) 
takusan waratta ne 
itadakimasu 
gochisōsama 
shiawase gurafiti 

taberu tsukuru 
tsukuru taberu 
taberu tsukuru 
futari do~ubido~uba 
tsukuru tsukuru 
taberu taberu 
warau warau 
futari do~ubido~uba 
taberu tsukuru taberu 
tsukuru taberu tsukuru 
taberu tsukuru taberu 
futari do~ubido~uba 
tsukuru tsukuru taberu 
taberu taberu tsukuru 
warau warau 
futari do~ubido~uba