YOU SAID:
When you're the best of friends Having so much fun together
INTO JAPANESE
最高の友達になったとき
BACK INTO ENGLISH
When you become your best friend
INTO JAPANESE
親友になったとき
BACK INTO ENGLISH
When you become a close friend
INTO JAPANESE
親しい友達になったとき
BACK INTO ENGLISH
When you become a close friend
Okay, I get it, you like Translation Party.