Heroic Harem Resort

You lead a somewhat boring life, when suddenly your hometown is covered by a demonic spell, just when you were about to have fun with an amazingly hot girl you just met at a party.
Just as you expect to die, you miraculously get saved, and brought to the paradisical mini-world of the “Hero Training & Recreation Resort”, a resort meant for heroes from many worlds and species to relax and escape their exhausting life as heroes for a while.