- Find a hotel in Tokyo for the next few days
- Apply for an evisa for Vietnam.
- Call your lodging in Vietnam and explain you’ll be a few days late. You’ll have to swallow any penalty and surrender any non-refundable nights.
- Enjoy Tokyo
- when you get your Vietnam e-visa, book a new ticket to Vietnam for the following day
Give yourself a little grace. These things happen and you know this won’t happen to you again now that the lesson is learned.
25 years of solo travel and I almost made the same mistake earlier this year in another country but caught it in time to cancel my airfare for a full refund.
Algeria