YOU SAID:
q w e r t y u I o p a s d f g h j k l z x c v b n m
INTO JAPANESE
qwertyu私はopasdfghjklzxcvbnm
BACK INTO ENGLISH
qwertyu I'm opasdfghjklzxcvbnm
INTO JAPANESE
qwertyu私はopasdfghjklzxcvbnmだ
BACK INTO ENGLISH
qwertyu私はopasdfghjklzxcvbnmだ
INTO JAPANESE
qwertyu私はopasdfghjklzxcvbnmだ
BACK INTO ENGLISH
qwertyu私はopasdfghjklzxcvbnmだ
You've done this before, haven't you.