NOBY NOBY BOY - Eat Your Words Trophy, Japanese 

Directions:
access the manual (Select) or credits (left + Select)
activate the boy with triangle
search out the letters N O B Y N O B Y B O Y and eat them (L2) in that order
If you happen to eat anything else in between pop stuff out with R2 and start again (no need to go back into the game).
Manual letters go back once you browse through them, credit ones stay where they were moved (making it easier).
Eating up NOBYNOBYBOY in hiragana (のびのびＢＯＹ） doesn't get the trophy: • NOBY NOBY BOY - Eat Yo...
If you get too frustrated, change system language to English and the game will be in English as well, at which point just eat one of the plentiful instances of NOBYNOBYBOY, once again in that order and throwing out everything inbetween.