You can bid at any price that is JPY 100 or more higher than the current price.

Once a bid is made, it cannot be canceled or changed. The auction ends at 20:00~20:59 (Japan time) the next day after the first bid is made, and the highest bidder is the winner.

If a bid is made with less than 5 minutes remaining, the bid will be automatically extended for 5 minutes.

(Example)
First bid date & time : 2025/06/04 16:15
Auction end date & time : 2025/06/05 20:15

If the seller confirms the winner during the auction, the auction will end before the end time.

Important
Mercari auction does NOT have automatic increments like Yahoo Auction.

(Example)
Yahoo Auction
Current price JPY 10,000
If you bid JPY 20,000, the price goes up to JPY 10,100 until max. JPY20,000 automatically according to bidding by competitors.

Mercari Auction
Current price JPY 10,000
If you bid JPY 20,000, the price goes up to JPY 20,000 instantly.