Gendai de Monster Kujo Gyousha wo Yattetara Shachou ga Akaji wo Nantoka suru Tame ni Muri wo Shita Sei de Shain no Hotondo ga Shinda kara Zutto Hitori de Shigot

Fifty years have passed since monsters [alien species] began appearing in the world. Arano, an ordinary young man, uses his experience and imagination to fight today's dangerous monsters!