Flight question - kinda complex.

[Nevada]

Hey guys, quick question,
Went to Japan 7 months ago for 3 months, i was originally only going for 2 months but on the day of my flight i was really sick so i ended up not catching the flight and staying another month - i purchased a return flight from Narita to UK.
Due to fly back on 30th april, problem is i'm going to attend a friends wedding then do random activities such as snowboarding and so on and have no idea when i'd be coming back, or if i would be flying onwards to another country (been invited to Australia with some friends but theyre not sure of the dates yet either).

So getting down to it, would i have problems getting back into japan on a return-leg ticket WITHOUT having an exiting flight already purchased, if i explain the situation to the immigration officer?

 

[Glenski]

If you don't have some sort of visa for work or spouse, the airline (not immigration) will probably not let you board with just a one-way ticket and no prescribed exit. Call your airline to confirm what you should do. Probably best thing is to get that onward ticket, so push your friends for dates.