I don't know how money works in Japan, but humor me for a minute.
250,000 yen per month times 12 months equals 3,000,000 yen per year. As of now that equals about $27,403.35. Assuming a 40 hour work week, U.S. federal minimum wage earns you $15,080.00 per year. So he's basically earning just under twice American minimum wage. Bear in mind that the average American income is $63,179 per year. So he's earning less than half of the average American income for 24 hour full time labor and no days off, and he has to SAVE A FUCKING PLANET. This is bullshit. Talk about working for a black company, he's better off being a neet or flipping burgers at McDonald's.