Suzukuri Dragon

A dragon male (the protagonist) must, in order to marry, amass a lot of treasures and wealth in his dungeon. For that reason, the protagonist went alone and lived in an area where human lives, constructed a huge nest and started amassing treasures. However, soon after the nest got built, gallant heroes wanting to exterminate dragons, townspeople that see the dragon as a nuisance and adventurers and thief out to get the dragon's treasure came. With this, he couldn't gather treasures at ease. The...