Neet Dakedo Hello Work Ni Ittara Isekai Ni Tsuretekareta

The NEET Yamano Masaru (23 y/o) went to Hello Work and finds an interesting job offer. [A test play of the Miniature Garden "Razgrad World." Extended period of time, preferred to be able to live on site. Monthly salary of 250,000 + commission.] Immediately goes to the interview and signs a contract. However, the place of employment is another world. Because of the contract he's taken there, to survive Masaru received a cheat, but he is told the shocking truth. "This world will be destroyed in 20 years." Can a simple NEET prevent the destruction of the world?!