Honoo no Haramase Tenkousei, 15 Bishoujo Hyouryuuki Recommendations
Though the setting is different, both have the same protagonist on the hunt for all the girls around him in different situations.
Both titles are about the protagonist hunting down for one girl after another in a non-aggressive matter, so both titles are free of any dark tones and the characters are in mutual agreement giving the titles a light-hearted tone.
Both are hentai with three episodes about a guy that tries to sleep with as much women as possible. Both are harem genre, but 15 Bishoujo Hyouryuuki is more comedy.