The original user of the D-Dial was Lala, being its inventor. It first appeared in Chapter 1 of the To LOVE-Ru series when Lala used it to summon Vacuum-kun (a giant vacuum that has eight tentacles and has a much stronger sucking power than a regular vacuum) against Zastin, Maul and Smutts. Later on, it is revealed that she had already created other versions of her D-Dial for Nana and Momo, who use them to call upon animals and plants respectively.