or we could all help you out when you're in Japan??
just my personal opinion, but perhaps your friend might be more anxious and stressed out than you, seeing that everything is so new to him and knowing that he needs to be extra extra careful with everything and everyone, especially with you. Feeling like that for 3 months is certainly going to spoil the whole vacation. i'd say give him some slack and believe in your childhood friend - come what may. Nonetheless, MMM is right, you prolly need some time away from each other in between. You guys are taking separate rooms, i assume??