The 100-minute film has made 870 million yen (8.44 million USD) so far.
It made its No.1 debut in the mini-theater ranking last weekend, then dropped two positions to third in its second weekend.
The 118-minute film has made 1.25 billion yen (12 million USD) in three weeks to become the fourth top-grossing live-action film of 2020 based on Japanese manga.