In a Japanese auction, the participant does not enter their bid individually; bidding begins from the starting price set by the organizer and changes (increases or decreases) in predetermined increments.
A checkbox appears next to the current price level. You will need to confirm the bid in each round as long as you can commit to the price level. If you no longer confirm your bid in a particular round, the auction will end for you for that item, but you will see the next best bid (if there is one).
The auction will run until the last acceptance (yes). The auction ends when no more participants have confirmed the price level of the current round. The last remaining participant to accept the prices in each round from the first bid until the other participants have left the competition is the winner.