Just WHO OR WHAT are the Tokonatsu Sisters anyway?
Was there ever an explanation as to what happens to the Alters after they stop being used? Or more importantly, the matter that gets rebuilt into the Alters? It seems like they just disintegrate into nothing without the matter used to build them coming back.
Why was Ayase given a device that actually monitored her brother's heart beat, instead of a device that merely acted like that and just telling her that it monitored her brother?