Elf Princess Rane

Gou is a fast-talking, reckless, and a little dense treasure hunter who has sworn to find the legendary Treasure of Salamander. While he is searching for it, he meets Rane, a fairy from another world who is looking for the Treasure of Four Hearts. Gou's childhood friend and well-off next-door neighbour Mari is fed up with him chasing after treasures, but she befriends Lean, another fairy, who also happens to be a witch that wants to kill Rane. As if that were not enough, Gou also has to deal with his triplet older sisters, Kazuki, Yuhki and Saki, who are a girl group when they are not at their day jobs. Gou and Rane's treasure hunt ends up interfering with a secret project run by Mari's father, and it turns out Salamander is not what Gou thought it was in the first place...