Quantum annealing is an algorithm to solve combinatorial optimization problems, and is expected to solve large-scale problems that are unsolvable with traditional algorithms. Since it specializes in combinatorial optimization problems, the hurdles to implementing the hardware are lower than those of quantum computers, and it is closer to implementation within society. Mercari’s quantum annealing project aims to build more efficient algorithms by smartly utilizing the unique physical characteristics of quantum annealing machines. We will also use classical annealing machines, inspired by quantum annealing, and solve issues that exist in the real world.