@Darudius - Isn't that how all manga seems to work? Tease until the end. And usually barely implies any kind of ending outside of XX and XY getting together? Probably the only down side of manga. Very rarely do they have endings or real progress in their stories until the literal end.
@Darudius
Nothing will happen at all, since the end is them going their separate ways, since they have a time limit on how long they can live in this building and after they both move they won't be neighbors and won't see each other any more.