Alvin is drawn with such a feminine face that I thought he might have secretly been a woman (turning this into a yuri harem series), but nope. Maybe the artist just doesn't know how to draw masculine faces...or maybe Alvin is just supposed to exhibit that contrast.
I thought this had a bunch more chapters done previously, but I think I was thinking of a different manga with the same premise...I think it was something like, the hero's party still hasn't left the starter town. Edit: took ages to find but this was it:
Yuusha-sama, Sakuya mo Otanoshimi deshita ne. No updates in a while though.