Isekai nara NEET ga Hataraku to Omotta? (Light Novel)

Suddenly summoned to another world, the teenage NEET, Houbami Reiji, is asked to fight for the summoner, Tifalycia Cleargreen, in Heroic War as a Hero for her race. Reiji refused outrightly, as it is natural that a NEET would not work. However, Tifalycia is not in a good situation currently, what will Reiji do to overcome the odds as he gets dragged into her situation? And it appears that Reiji is not a simple NEET as he seems on the surface.