It's been so long since I last read the WN, I already forget most things..... but the things I do remember are that the hero is a certified dumbass, and the four girls all get their own Demon partner....
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@HaikenEdge that would involve him doing something "nice" for someone by giving it as a gift. With the way this story has been going and how dumb this "hero" is, I'm guessing its a cursed shovel and they decide to dig with it, which will somehow create a hole for a demon to be released or something dumb like that.