These small beetles are referred to as the Ladybug. First, let's start with a little background information on this specific ladybug. The release was an effort to find a beneficial insect to control harmful insects and provide an alternative to pesticides.
Ladybugs spend the spring and summer in the trees feeding on aphids.
It has proved to be a successful program and they have multiplied and spread. The beetles seem to be attracted to white or bright-colored surfaces. They may be drawn to a particular house because of the color of the exterior or it may simply be that it's the first house they fly towards. In Japan they cluster on high cliffs. They are highly migratory and will move many miles in Oct. and Nov. to a high site, sometimes a house.