to go to japan you need to be friend with adrian, i think this mean making him stay and not leave the house. This would make sense since there is no variable in the save file called "adrian-friend" or whatever BUT there is one that's called "adrian-will-stay" 
I personally never gave money to adrian for his trip to japan (even the variable for this in my save is on false) and i can go to japan just fine. I did told him to stay and chose the sharing route with anna, so if setting [rid 2013] "adrian-will-stay-start" on true didn't work you can check my first post on this topic about [rid 2265] "anna-will-seduce-adrian" just to be sure it also on true
